mb/google/poppy/variant/atlas: Update PL2 based on CPU sku

This patch adds a function to overwrite PL2 setting based on CPU
sku. From doc #594883, PL2 is 18W for AML-Y.

BUG=b:110890675
BRANCH=None
TEST=emerge-atlas coreboot chromeos-bootimage & test with AML-Y
     and KBL-Y skus.

Change-Id: I468befcd2c4ad6c2bb9ae91b323a43f87ff65a26
Signed-off-by: Gaggery Tsai <gaggery.tsai@intel.com>
Reviewed-on: https://review.coreboot.org/27765
Reviewed-by: Caveh Jalali <caveh@google.com>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2 files changed