[XS] Change in coreboot[main]: mb/google/nissa/var/pujjoniru: Modify the gpio of GPIO_PCH_WP

[Dinesh Gehlot (Code Review)]

Attention is currently required from: Eric Lai, Jayvik Desai, Kapil Porwal, Nick Vaccaro, Qinghong Zeng, Subrata Banik, hualin wei.

Dinesh Gehlot has posted comments on this change by hualin wei. ( https://review.coreboot.org/c/coreboot/+/86510?usp=email )

Change subject: mb/google/nissa/var/pujjoniru: Modify the gpio of GPIO_PCH_WP
......................................................................

Patch Set 3:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/86510/comment/744229b0_33f3b6ad?usp... :
PS3, Line 15: Build coreboot, flash, boot to
            : and log into kernel, execute "wp enable" in console,
            : execute "crossystem" at kernel prompt and verify that "wpsw_cur"
            : shows as being "1", Execute "wp disable" in console, execute
            : "crossystem" at kernel prompt and verify "wpsw_cur" is 0.
wp status update verified by toggling it on and off.

File src/mainboard/google/brya/variants/baseboard/nissa/include/baseboard/gpio.h:

https://review.coreboot.org/c/coreboot/+/86510/comment/f6f113ab_31c94963?usp... :
PS3, Line 14: #if CONFIG(BOARD_GOOGLE_PUJJONIRU)
            :  #define GPIO_PCH_WP		GPP_E17
            : #else
            :  #define GPIO_PCH_WP		GPP_E12
            : #endif
Instead of adding a condition to the baseboard, we can update the WP GPIO at a specific variant level. In this case, we can update `pujjoniru/include/variant/gpio.h` as below

```
#undef GPIO_PCH_WP
#define GPIO_PCH_WP		GPP_E17
```