Change in coreboot[master]: mb/google/guybrush/var/nipperkin: Update SPKR GPIO configuration

[Rob Barnes (Code Review)]

Attention is currently required from: Kevin Chiu, Bhanu Prakash Maiya, Eric Peers, Karthik Ramasubramanian.
Rob Barnes has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/59051 )

Change subject: mb/google/guybrush/var/nipperkin: Update SPKR GPIO configuration
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Patch Set 3:

(3 comments)

File src/mainboard/google/guybrush/variants/nipperkin/gpio.c:

https://review.coreboot.org/c/coreboot/+/59051/comment/bf19d5b6_ed865fcc 
PS3, Line 39: 	/* EN_SPKR */
Should disconnect baseboard EN_SPKR / GPIO_31

https://review.coreboot.org/c/coreboot/+/59051/comment/4c683ad9_b6846e29 
PS3, Line 40: 	PAD_GPO(GPIO_70, HIGH),
Should sdmode_gpio in nipperkin/overridetree.cb be GPIO_70?

https://review.coreboot.org/c/coreboot/+/59051/comment/eb74a8b6_60171b0f 
PS3, Line 61: 	PAD_NC(GPIO_18),
GPIO_70 is disconnected in baseboard pcie_gpio_table. Should connect here.