headers: don't depend on errno.h being available

These headers follow the pattern:

| #if CONFIG_IS_ENABLED(FANCY_FEATURE)
|   void foo(void);
| #else
|   static inline void foo(void) { return -ENOSYS; }
| #endif

In the #else path ENOSYS is used, however linux/errno.h is not included.
If errno.h has not been included already the compiler errors out even
if the inline function is not referenced.

Make those headers self contained.

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/dfu.h

@@ -10,6 +10,7 @@
 #ifndef __DFU_ENTITY_H_
 #define __DFU_ENTITY_H_
 
+#include <linux/errno.h>
 #include <linux/list.h>
 #include <mmc.h>
 #include <spi_flash.h>

include/dm/pinctrl.h

@@ -6,6 +6,8 @@
 #ifndef __PINCTRL_H
 #define __PINCTRL_H
 
+#include <linux/errno.h>
+
 #define PINNAME_SIZE	10
 #define PINMUX_SIZE	90
 

include/hwspinlock.h

@@ -6,6 +6,8 @@
 #ifndef _HWSPINLOCK_H_
 #define _HWSPINLOCK_H_
 
+#include <linux/errno.h>
+
 /**
  * Implement a hwspinlock uclass.
  * Hardware spinlocks are used to perform hardware protection of

include/i2c_eeprom.h

@@ -6,6 +6,8 @@
 #ifndef __I2C_EEPROM
 #define __I2C_EEPROM
 
+#include <linux/errno.h>
+
 struct udevice;
 
 struct i2c_eeprom_ops {

include/nvmem.h

@@ -6,6 +6,8 @@
 #ifndef NVMEM_H
 #define NVMEM_H
 
+#include <linux/errno.h>
+
 /**
  * DOC: Design
  *

include/power-domain.h

@@ -6,6 +6,8 @@
 #ifndef _POWER_DOMAIN_H
 #define _POWER_DOMAIN_H
 
+#include <linux/errno.h>
+
 /**
  * A power domain is a portion of an SoC or chip that is powered by a
  * switchable source of power. In many cases, software has control over the

include/power/regulator.h

@@ -7,6 +7,8 @@
 #ifndef _INCLUDE_REGULATOR_H_
 #define _INCLUDE_REGULATOR_H_
 
+#include <linux/errno.h>
+
 struct udevice;
 
 /**

include/remoteproc.h

@@ -14,6 +14,7 @@
  * platforms have moved to dm/fdt.
  */
 #include <dm/platdata.h>	/* For platform data support - non dt world */
+#include <linux/errno.h>
 
 /**
  * struct fw_rsc_hdr - firmware resource entry header

include/soc.h

@@ -7,6 +7,8 @@
 #ifndef __SOC_H
 #define __SOC_H
 
+#include <linux/errno.h>
+
 #define SOC_MAX_STR_SIZE	128
 
 struct udevice;

include/spi-mem.h

@@ -11,6 +11,8 @@
 #ifndef __UBOOT_SPI_MEM_H
 #define __UBOOT_SPI_MEM_H
 
+#include <linux/errno.h>
+
 struct udevice;
 
 #define SPI_MEM_OP_CMD(__opcode, __buswidth)			\

include/sysinfo.h

@@ -7,6 +7,8 @@
 #ifndef __SYSINFO_H__
 #define __SYSINFO_H__
 
+#include <linux/errno.h>
+
 struct udevice;
 
 /*

include/tlv_eeprom.h

@@ -7,6 +7,8 @@
 #ifndef __TLV_EEPROM_H_
 #define __TLV_EEPROM_H_
 
+#include <linux/errno.h>
+
 /*
  *  The Definition of the TlvInfo EEPROM format can be found at onie.org or
  *  github.com/onie