AGESA f14: Consolidate XIP cache

Do this like fam15tn to reduce code duplication.

Change-Id: I064fd27b85be7fb0c9d6918a84fc6f9b17065534
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17563
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
12 files changed