mb/google/brya: add HAS_RECOVERY_MRC_CACHE flag

Brya’s chromeos.fmd contains a region for RECOVERY_MRC_CACHE,
but does not select HAS_RECOVERY_MRC_CACHE, so it’s unused.

BUG=b:174266035
TEST=Check MRC cache can allocate in recovery mode.

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I6b83eec3dcf27bafde610a701e55f1371a5d4571
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51081
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/brya/Kconfig

@@ -26,6 +26,7 @@ config BASEBOARD_BRYA_LAPTOP
 config CHROMEOS
 	select EC_GOOGLE_CHROMEEC_SWITCHES
 	select GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC
+	select HAS_RECOVERY_MRC_CACHE
 	select VBOOT_LID_SWITCH
 
 config DEVICETREE