All AGESA f15tn boards use the same MTRR values. Factor them out,
while still allowing a board to override them via BLDCFG.
TEST=Use abuild --timeless to check that all AGESA f14/f15tn/f16kb
mainboards result in identical coreboot binaries.
Change-Id: I90c95493de1bb5b8f32c06b9575fef3aa7aca031
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41664
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mike Banon <mikebdp2@gmail.com>
7ee8e7f129