x86: Introduce USE_EARLY_BOARD_INIT option

Introduce USE_EARLY_BOARD_INIT option and select it by the actual users.

Cc: George McCollister <george.mccollister@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Aiden Park <aiden.park@intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

board/google/chromebook_coral/Kconfig

@@ -18,6 +18,7 @@ config SYS_TEXT_BASE
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select X86_RESET_VECTOR
+	select USE_EARLY_BOARD_INIT
 	select INTEL_APOLLOLAKE
 	select BOARD_ROMSIZE_KB_16384
 

board/google/chromebook_link/Kconfig

@@ -19,6 +19,7 @@ config SYS_TEXT_BASE
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select X86_RESET_VECTOR
+	select USE_EARLY_BOARD_INIT
 	select NORTHBRIDGE_INTEL_IVYBRIDGE
 	select HAVE_INTEL_ME
 	select BOARD_ROMSIZE_KB_8192

board/google/chromebook_samus/Kconfig

@@ -19,6 +19,7 @@ config SYS_TEXT_BASE
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select X86_RESET_VECTOR
+	select USE_EARLY_BOARD_INIT
 	select INTEL_BROADWELL
 	select HAVE_INTEL_ME
 	select BOARD_ROMSIZE_KB_8192