Change in coreboot[master]: cpu/x86/mtrrlib: Add function to cover region with 1 MTRR

[Arthur Heymans (Code Review)]

Hello build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/64223

to look at the new patch set (#9).

Change subject: cpu/x86/mtrrlib: Add function to cover region with 1 MTRR
......................................................................

cpu/x86/mtrrlib: Add function to cover region with 1 MTRR

This will come in handy to set up caching for other region in early
stages.

TESTED on foxconn g41: romstage is still properly cached.

Change-Id: I477cd9de4a9da48151f8b8b3bb7dc36c67bb69ae
Signed-off-by: Arthur Heymans 
---
M src/cpu/x86/mtrr/mtrrlib.c
M src/cpu/x86/mtrr/xip_cache.c
M src/include/cpu/x86/mtrr.h
3 files changed, 29 insertions(+), 12 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/23/64223/9