[L] Change in coreboot[main]: util/ifdtool: Add new cmdline to enable GPR0 protection

[Subrata Banik (Code Review)]

Attention is currently required from: Reka Norman, Stefan Reinauer.

Hello Reka Norman, Stefan Reinauer, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/80235?usp=email

to look at the new patch set (#4).

The following approvals got outdated and were removed:
Code-Review+2 by Stefan Reinauer, Verified+1 by build bot (Jenkins)

The change is no longer submittable: Code-Review and Verified are unsatisfied now.

Change subject: util/ifdtool: Add new cmdline to enable GPR0 protection
......................................................................

util/ifdtool: Add new cmdline to enable GPR0 protection

This patch adds new cmdline `-E` support in the IFD Tool so that
users (mostly factory) can enable GPR0 protection.
Additionally, perform some code refactoring while adding support
for enable GPR0 protection.

BUG=b:270275115
TEST=Able to test GPR0 protection on google/rex and google/yahiko.
> ifdtool -p mtl -E image.bin -O image.bin_lock

...
Value at GPRD offset (64) is 0x83220004
--------- GPR0 Protected Range --------------
Start address = 0x00004000
End address = 0x00322fff
...
GPR0 protection is now enabled

Change-Id: I27c533ae4109c79299f4e7ff75e750d7cc64280f
Signed-off-by: Subrata Banik 
---
M util/ifdtool/ifdtool.c
M util/ifdtool/ifdtool.h
2 files changed, 230 insertions(+), 24 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/35/80235/4