[M] Change in coreboot[main]: mb/google/brox: Fix booting to kernel without battery

[Sowmya Aralguppe (Code Review)]

Attention is currently required from: Ashish Kumar Mishra, Caveh Jalali, Dinesh Gehlot, Eric Herrmann, Forest Mittelberg, Jayvik Desai, Karthik Ramasubramanian, Keith Short, Krishna P Bhat D, Nick Vaccaro, Paul Menzel, Rishika Raj, Ronak Kanabar, Shelley Chen, Sowmya Aralguppe, Subrata Banik.

Sowmya Aralguppe has posted comments on this change by Sowmya Aralguppe. ( https://review.coreboot.org/c/coreboot/+/83752?usp=email )

Change subject: mb/google/brox: Fix booting to kernel without battery
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Patch Set 24:

(1 comment)

File src/mainboard/google/brox/variants/baseboard/brox/ramstage.c:

https://review.coreboot.org/c/coreboot/+/83752/comment/1afeb40b_f0db7709?usp... :
PS19, Line 57:  * PL4 calculations - For USB C charger (Max Power):
> Got it - my experiments were with pl4 = 19 and pl4 = 23 for 65 watts adaptors and the observations w […]

subrata >>>if we know that OS can override the PL4 table dynamically and we only need to set a lower P4 when battery is not present. Then, it would be good to boot with a static configuration which is safest and generically applicable.
Adding logic to configure PL4 based on USB-PD capacity seems overdoing for BIOS.

Done - PL4 value is static = 9 watts (30W * 32%)