Enable separate MRC cache for recovery mode. This requires change in
flash layout to accomodate another region for RECOVERY_MRC_CACHE.
BUG=b:69473883
TEST=Verified following scenarios:
1. Boot into recovery does not destroy normal mode MRC cache.
2. Once recovery MRC cache is populated, all future boots in recovery
mode re-use data from the cache.
3. Forcing recovery mode to retrain memory causes normal mode to retrain
memory as well.
Change-Id: Icdfac3698507d89d98a51cfc3d756a56d2a2d648
Signed-off-by: Shelley Chen <shchen@chromium.org>
Reviewed-on: https://review.coreboot.org/22518
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
9af3f2d63a