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>
diff --git a/arch/x86/cpu/baytrail/Kconfig b/arch/x86/cpu/baytrail/Kconfig
index ac27e7a..57a3a96 100644
--- a/arch/x86/cpu/baytrail/Kconfig
+++ b/arch/x86/cpu/baytrail/Kconfig
@@ -10,6 +10,7 @@
 	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
diff --git a/arch/x86/cpu/broadwell/Kconfig b/arch/x86/cpu/broadwell/Kconfig
index f3006c3..a9a461d 100644
--- a/arch/x86/cpu/broadwell/Kconfig
+++ b/arch/x86/cpu/broadwell/Kconfig
@@ -8,6 +8,7 @@
 	select CACHE_MRC_BIN
 	select ARCH_EARLY_INIT_R
 	imply HAVE_INTEL_ME
+	imply ENABLE_MRC_CACHE
 
 if INTEL_BROADWELL
 
diff --git a/arch/x86/cpu/ivybridge/Kconfig b/arch/x86/cpu/ivybridge/Kconfig
index ed6b834..5df5e3a 100644
--- a/arch/x86/cpu/ivybridge/Kconfig
+++ b/arch/x86/cpu/ivybridge/Kconfig
@@ -9,6 +9,7 @@
 	bool
 	select CACHE_MRC_BIN if HAVE_MRC
 	imply HAVE_INTEL_ME
+	imply ENABLE_MRC_CACHE
 
 if NORTHBRIDGE_INTEL_IVYBRIDGE
 
diff --git a/arch/x86/cpu/quark/Kconfig b/arch/x86/cpu/quark/Kconfig
index 9e7d983..68bb219 100644
--- a/arch/x86/cpu/quark/Kconfig
+++ b/arch/x86/cpu/quark/Kconfig
@@ -9,6 +9,7 @@
 	select HAVE_RMU
 	select ARCH_EARLY_INIT_R
 	select ARCH_MISC_INIT
+	imply ENABLE_MRC_CACHE
 
 if INTEL_QUARK