soc/intel/common: Add functions into common system agent library

This patch to add helper functions for memory layout design
based on PCI Host Bridge/DRAM registers.

BRANCH=none
BUG=b:63974384
TEST=Build and boot eve successfully.

Change-Id: I95250ef493c9844b8c46528f1f7de8a42cba88a2
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/21133
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
4 files changed