soc/intel/cannonlake: Enable MRC cache

Enable MRC cache by default.

TEST=Warm reset and check coreboot serial log, MRC related log can be
seen.

Change-Id: I76ece361867737c01cc848c24d8893d43a3d292e
Signed-off-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/21892
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/cannonlake/Kconfig

@@ -15,6 +15,7 @@ config CPU_SPECIFIC_OPTIONS
 	select BOOT_DEVICE_SPI_FLASH_RW_NOMMAP_EARLY if BOOT_DEVICE_SPI_FLASH
 	select BOOT_DEVICE_SUPPORTS_WRITES
 	select C_ENVIRONMENT_BOOTBLOCK
+	select CACHE_MRC_SETTINGS
 	select COMMON_FADT
 	select CPU_INTEL_FIRMWARE_INTERFACE_TABLE
 	select GENERIC_GPIO_LIB
@@ -26,6 +27,7 @@ config CPU_SPECIFIC_OPTIONS
 	select INTEL_CAR_NEM_ENHANCED
 	select INTEL_GMA_ADD_VBT_DATA_FILE if RUN_FSP_GOP
 	select IOAPIC
+	select MRC_SETTINGS_PROTECT
 	select PARALLEL_MP
 	select PARALLEL_MP_AP_WORK
 	select PLATFORM_USES_FSP2_0