Change in coreboot[master]: Pass the EN_SPKR gpio in devicetree for guybrush

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: V sujith kumar Reddy, Raul Rangel, Rob Barnes.
Karthik Ramasubramanian has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/60314 )

Change subject: Pass the EN_SPKR gpio in devicetree for guybrush
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Patch Set 2:

(2 comments)

Patchset:

PS2: 
Is

File src/mainboard/google/guybrush/variants/baseboard/devicetree.cb:

https://review.coreboot.org/c/coreboot/+/60314/comment/b3d6e4a7_d7ca08d7 
PS2, Line 328: GPIO_31
Pass GPIO_70 in the baseboard devicetree since that will apply to both Nipperkin and Dewatt.

Override it as GPIO_31 in just guybrush overridetree.cb. This will minimize the number of changes required.