[S] Change in coreboot[master]: vboot: Drop argument to select slot from `vb2ex_ec_protect()`

[Subrata Banik (Code Review)]

Attention is currently required from: Julius Werner, Yu-Ping Wu.

Hello Julius Werner, Yu-Ping Wu,

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

https://review.coreboot.org/c/coreboot/+/75521?usp=email

to look at the new patch set (#2).

Change subject: vboot: Drop argument to select slot from `vb2ex_ec_protect()`
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vboot: Drop argument to select slot from `vb2ex_ec_protect()`

vboot code changes has eliminated the redundant call to WP the EC-RO
region as protecting RW flash implies protecting both RO and RW flash,
so the call to protect RO is redundant. google/rex is currently takes
about 17 ms to lock down the EC.

Along with vboot changes, this patch drops argument to choose between
RO and RW slot to protect while calling into `vb2ex_ec_protect()`.
It ensures vb2ex_ec_protect() is explicitly meant for protecting RW
regions.

BUG=b:281918204
TEST=Able to build and boot google/rex and observed boot time savings.

Change-Id: I2974f0cb43ba800c2aaeac4876ebaa052b5ee793
Signed-off-by: Subrata Banik 
---
M src/security/vboot/ec_sync.c
1 file changed, 4 insertions(+), 7 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/21/75521/2