AGESA vendorcode: Add ENABLE_MRC_CACHE option

When selected, try to store and restore memory training
results from/to SPI flash. This change only pulls in
the required parts from vendorcode for the build.

Change-Id: I12880237be494c71e1d4836abd2d4b714ba87762
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/21446
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2 files changed