Change in coreboot[master]: mb/google/guybrush/var/guybrush: Add FPMCU configration

[Furquan Shaikh (Code Review)]

Attention is currently required from: Bhanu Prakash Maiya, Ivy Jian.
Furquan Shaikh has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52181 )

Change subject: mb/google/guybrush/var/guybrush: Add FPMCU configration
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Patch Set 9:

(1 comment)

File src/mainboard/google/guybrush/variants/guybrush/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/52181/comment/7357ab3f_150a962b 
PS9, Line 113: register "has_power_resource" = "1"
This will not work for FPMCU. We want FPMCU to be kept enabled in S3 and S0i3 states. Adding power resource here will cause the device to be turned off in S3/S0i3.