mb/google/octopus: enable MRC recovery cache

Enable the recovery cache to speed up recovery flows. Also
enable clearing of the normal mrc cache on recovery forced retrains.

BUG=b:77871444
TEST=went into recovery twice. 2nd time it boots faster.

Change-Id: Idfce42ac835637fa521545fadfedecd65df91d4c
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/25613
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Justin TerAvest <teravest@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/octopus/Kconfig

@@ -28,6 +28,8 @@ config CHROMEOS
 	default y
 	select EC_GOOGLE_CHROMEEC_SWITCHES
 	select GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC
+	select HAS_RECOVERY_MRC_CACHE
+	select MRC_CLEAR_NORMAL_CACHE_ON_RECOVERY_RETRAIN
 	select VBOOT_LID_SWITCH
 
 config MAINBOARD_DIR