x86: kconfig: Imply ENABLE_MRC_CACHE in the platform Kconfig

Platform knows whether MRC cache is implemented, but using it can
be a choice of a specific board.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/baytrail/Kconfig

@@ -10,6 +10,7 @@ config INTEL_BAYTRAIL
 	select ARCH_MISC_INIT if !EFI
 	imply ENV_IS_IN_SPI_FLASH
 	imply HAVE_INTEL_ME if !EFI
+	imply ENABLE_MRC_CACHE
 
 if INTEL_BAYTRAIL
 config INTERNAL_UART

arch/x86/cpu/broadwell/Kconfig

@@ -8,6 +8,7 @@ config INTEL_BROADWELL
 	select CACHE_MRC_BIN
 	select ARCH_EARLY_INIT_R
 	imply HAVE_INTEL_ME
+	imply ENABLE_MRC_CACHE
 
 if INTEL_BROADWELL
 

arch/x86/cpu/ivybridge/Kconfig

@@ -9,6 +9,7 @@ config NORTHBRIDGE_INTEL_IVYBRIDGE
 	bool
 	select CACHE_MRC_BIN if HAVE_MRC
 	imply HAVE_INTEL_ME
+	imply ENABLE_MRC_CACHE
 
 if NORTHBRIDGE_INTEL_IVYBRIDGE
 

arch/x86/cpu/quark/Kconfig

@@ -9,6 +9,7 @@ config INTEL_QUARK
 	select HAVE_RMU
 	select ARCH_EARLY_INIT_R
 	select ARCH_MISC_INIT
+	imply ENABLE_MRC_CACHE
 
 if INTEL_QUARK