Change in coreboot[master]: mb/google/brya/var/baseboard/brask: Add power limits functions

[Hou-hsun Lee (Code Review)]

Attention is currently required from: Paul Menzel, Nick Vaccaro, Zhuohao Lee, Alan Huang.
Hou-hsun Lee has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/58241 )

Change subject: mb/google/brya/var/baseboard/brask: Add power limits functions
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Patch Set 14:

(1 comment)

File src/mainboard/google/brya/variants/baseboard/brask/ramstage.c:

https://review.coreboot.org/c/coreboot/+/58241/comment/a367cd9d_edc6c027 
PS14, Line 108: 	soc_config->tdp_pl4 = 0;
You set tdp_pl4 to 0 here, which means you must call variant_update_psys_power_limits() first, then call variant_update_power_limits(). Is that correct?
If yes, please add some comments in the code in case the scaling projects misuse them.