Change in coreboot[master]: mb/google/brya/var/kano: Update TDP PL1, PL2, and PL4 for U28 SKUs

[Peter Ou (Code Review)]

Attention is currently required from: David Wu, Tim Wawrzynczak, Ren Kuo, Sumeet R Pawnikar, Nick Vaccaro, Alan Huang.
Peter Ou has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62466 )

Change subject: mb/google/brya/var/kano: Update TDP PL1, PL2, and PL4 for U28 SKUs
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Patch Set 3:

(2 comments)

File src/mainboard/google/brya/variants/kano/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/62466/comment/c5d78ec7_8e3f3ff0 
PS3, Line 134: 20000
> Lowering PL1 max power value will impact the overall system performance.

our thermal design target is 18~20w, we still concern the thermal event when PL1 is over the TDP so we adjust the power limit.

https://review.coreboot.org/c/coreboot/+/62466/comment/f69c8c73_556bf104 
PS3, Line 141: 43000
> Normally, we keep max and min power value the same for PL2. […]

please David help to change the PL2_Mix/Min to 43W.