x86: Move coreboot sysinfo parsing into generic x86 code

It is useful to be able to parse coreboot tables on any x86 build which is
booted from coreboot. Add a new Kconfig option to enable this feature and
move the code so it can be used on any board, if enabled.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/x86/Kconfig

@@ -1047,4 +1047,25 @@ config INTEL_GMA_SWSMISCI
 
 endif # INTEL_SOC
 
+config COREBOOT_SYSINFO
+	bool "Support reading coreboot sysinfo"
+	default y if SYS_COREBOOT
+	help
+	  Select this option to read the coreboot sysinfo table on start-up,
+	  if present. This is written by coreboot before it exits and provides
+	  various pieces of information about the running system, including
+	  display, memory and build information. It is stored in
+	  struct sysinfo_t after parsing by get_coreboot_info().
+
+config SPL_COREBOOT_SYSINFO
+	bool "Support reading coreboot sysinfo"
+	depends on SPL
+	default y if COREBOOT_SYSINFO
+	help
+	  Select this option to read the coreboot sysinfo table in SPL,
+	  if present. This is written by coreboot before it exits and provides
+	  various pieces of information about the running system, including
+	  display, memory and build information. It is stored in
+	  struct sysinfo_t after parsing by get_coreboot_info().
+
 endmenu

arch/x86/cpu/coreboot/Makefile

@@ -20,5 +20,4 @@ else
 obj-y += sdram.o
 endif
 obj-y += coreboot.o
-obj-y += tables.o
 obj-y += timestamp.o

arch/x86/lib/Makefile

@@ -15,6 +15,7 @@ ifndef CONFIG_SPL_BUILD
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 endif
 obj-y	+= cmd_boot.o
+obj-$(CONFIG_$(SPL_)COREBOOT_SYSINFO)	+= coreboot/
 obj-$(CONFIG_SEABIOS) += coreboot_table.o
 obj-y	+= early_cmos.o
 obj-y	+= e820.o

arch/x86/lib/coreboot/Makefile

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier:	GPL-2.0+
+#
+# Copyright 2021 Google LLC
+#
+
+obj-y += cb_sysinfo.o