soc/intel/common: Add function to DLOCK PR registers

Add a function in FAST_SPI library to discrete lock the PR
registers 0 to 4.

BUG=none
BRANCH=none
TEST=Build and boot poppy

Change-Id: I46e1948315ea9489932efdf7d60d6d78ab3948a6
Signed-off-by: Barnali Sarkar <barnali.sarkar@intel.com>
Reviewed-on: https://review.coreboot.org/21063
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
3 files changed