Change in coreboot[master]: cpu/x86: Add function to set `put_back_original_solution` variable

[Subrata Banik (Code Review)]

Attention is currently required from: Subrata Banik.
Subrata Banik has uploaded a new patch set (#2) to the change originally created by Kane Chen. ( https://review.coreboot.org/c/coreboot/+/63485 )

Change subject: cpu/x86: Add function to set `put_back_original_solution` variable
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cpu/x86: Add function to set `put_back_original_solution` variable

`put_back_original_solution` variable in mtrr.c is static, but there is
a need to set put_back_original_solution outside of mtrr.c in order to
let `remove_temp_solution` to drop any temporary MTRRs being set
outside `mtrr_use_temp_range()`, for example: `set_var_mtrr()` function
is used to set MTRRs for the ROM caching.

BUG=b:225766934
TEST=Able to build and boot google/redrix.

Change-Id: Ic6b5683b2aa7398a5e141f710394ab772e9775e7
Signed-off-by: Kane Chen 
Signed-off-by: Subrata Banik 
---
M src/cpu/x86/mtrr/mtrr.c
M src/include/cpu/x86/mtrr.h
2 files changed, 6 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/85/63485/2