mb/siemens/mc_apl{2,4,5,6}: Enable recovery MRC cache

The mainboards mc_apl{2,4,5,6} use VBOOT for verification and can be in
a recovery state for different reasons. In this case we still want the
MRC cache to be around to avoid the DRAM retraining on every boot.

This patch enables the Kconfig switch HAS_RECOVERY_MRC_CACHE which makes
the already available MRC recovery region in FMAP useable.

Test=Boot mc_apl2 in recovery mode and make sure the recovery MRC
cache is used.

Change-Id: I2ea4993f05dd87a0e637f55e84b4fc06f5e29ecc
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61827
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>

src/mainboard/siemens/mc_apl1/variants/mc_apl2/Kconfig

@@ -11,6 +11,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select MAINBOARD_HAS_LPC_TPM
 	select TPM_ON_FAST_SPI
 	select TPM_MEASURED_BOOT
+	select HAS_RECOVERY_MRC_CACHE
 
 config CBFS_SIZE
 	default 0xb4e000

src/mainboard/siemens/mc_apl1/variants/mc_apl4/Kconfig

@@ -10,6 +10,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select TPM_ON_FAST_SPI
 	select DRIVERS_I2C_PTN3460
 	select TPM_MEASURED_BOOT
+	select HAS_RECOVERY_MRC_CACHE
 
 config UART_FOR_CONSOLE
 	default 1

src/mainboard/siemens/mc_apl1/variants/mc_apl5/Kconfig

@@ -14,6 +14,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select TPM_ON_FAST_SPI
 	select DRIVERS_I2C_PTN3460
 	select TPM_MEASURED_BOOT
+	select HAS_RECOVERY_MRC_CACHE
 
 config CBFS_SIZE
 	default 0xb4e000

src/mainboard/siemens/mc_apl1/variants/mc_apl6/Kconfig

@@ -13,6 +13,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select MAINBOARD_HAS_LPC_TPM
 	select TPM_ON_FAST_SPI
 	select TPM_MEASURED_BOOT
+	select HAS_RECOVERY_MRC_CACHE
 
 config VBOOT
 	select VBOOT_VBNV_FLASH