README: remove description about driver model configuration options

All the DM-related configuration options are described in Kconfig
helps.  They should not be duplicated in README.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>

README

@@ -690,119 +690,6 @@ The following options need to be configured:
 		exists, unlike the similar options in the Linux kernel. Do not
 		set these options unless they apply!
 
-- Driver Model
-		Driver model is a new framework for devices in U-Boot
-		introduced in early 2014. U-Boot is being progressively
-		moved over to this. It offers a consistent device structure,
-		supports grouping devices into classes and has built-in
-		handling of platform data and device tree.
-
-		To enable transition to driver model in a relatively
-		painful fashion, each subsystem can be independently
-		switched between the legacy/ad-hoc approach and the new
-		driver model using the options below. Also, many uclass
-		interfaces include compatibility features which may be
-		removed once the conversion of that subsystem is complete.
-		As a result, the API provided by the subsystem may in fact
-		not change with driver model.
-
-		See doc/driver-model/README.txt for more information.
-
-		CONFIG_DM
-
-		Enable driver model. This brings in the core support,
-		including scanning of platform data on start-up. If
-		CONFIG_OF_CONTROL is enabled, the device tree will be
-		scanned also when available.
-
-		CONFIG_CMD_DM
-
-		Enable driver model test commands. These allow you to print
-		out the driver model tree and the uclasses.
-
-		CONFIG_DM_DEMO
-
-		Enable some demo devices and the 'demo' command. These are
-		really only useful for playing around while trying to
-		understand driver model in sandbox.
-
-		CONFIG_SPL_DM
-
-		Enable driver model in SPL. You will need to provide a
-		suitable malloc() implementation. If you are not using the
-		full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START,
-		consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you
-		must provide CONFIG_SYS_MALLOC_F_LEN to set the size.
-		In most cases driver model will only allocate a few uclasses
-		and devices in SPL, so 1KB should be enable. See
-		CONFIG_SYS_MALLOC_F_LEN for more details on how to enable
-		it.
-
-		CONFIG_DM_SERIAL
-
-		Enable driver model for serial. This replaces
-		drivers/serial/serial.c with the serial uclass, which
-		implements serial_putc() etc. The uclass interface is
-		defined in include/serial.h.
-
-		CONFIG_DM_GPIO
-
-		Enable driver model for GPIO access. The standard GPIO
-		interface (gpio_get_value(), etc.) is then implemented by
-		the GPIO uclass. Drivers provide methods to query the
-		particular GPIOs that they provide. The uclass interface
-		is defined in include/asm-generic/gpio.h.
-
-		CONFIG_DM_SPI
-
-		Enable driver model for SPI. The SPI slave interface
-		(spi_setup_slave(), spi_xfer(), etc.) is then implemented by
-		the SPI uclass. Drivers provide methods to access the SPI
-		buses that they control. The uclass interface is defined in
-		include/spi.h. The existing spi_slave structure is attached
-		as 'parent data' to every slave on each bus. Slaves
-		typically use driver-private data instead of extending the
-		spi_slave structure.
-
-		CONFIG_DM_SPI_FLASH
-
-		Enable driver model for SPI flash. This SPI flash interface
-		(spi_flash_probe(), spi_flash_write(), etc.) is then
-		implemented by the SPI flash uclass. There is one standard
-		SPI flash driver which knows how to probe most chips
-		supported by U-Boot. The uclass interface is defined in
-		include/spi_flash.h, but is currently fully compatible
-		with the old interface to avoid confusion and duplication
-		during the transition parent. SPI and SPI flash must be
-		enabled together (it is not possible to use driver model
-		for one and not the other).
-
-		CONFIG_DM_CROS_EC
-
-		Enable driver model for the Chrome OS EC interface. This
-		allows the cros_ec SPI driver to operate with CONFIG_DM_SPI
-		but otherwise makes few changes. Since cros_ec also supports
-		I2C and LPC (which don't support driver model yet), a full
-		conversion is not yet possible.
-
-
-		** Code size options: The following options are enabled by
-		default except in SPL. Enable them explicitly to get these
-		features in SPL.
-
-		CONFIG_DM_WARN
-
-		Enable the dm_warn() function. This can use up quite a bit
-		of space for its strings.
-
-		CONFIG_DM_STDIO
-
-		Enable registering a serial device with the stdio library.
-
-		CONFIG_DM_DEVICE_REMOVE
-
-		Enable removing of devices.
-
 
 - Linux Kernel Interface:
 		CONFIG_CLOCKS_IN_MHZ