Change in coreboot[master]: mb/google/corsola: Revise power-on sequence of PS8640

[Rex-BC Chen (Code Review)]

Attention is currently required from: Hung-Te Lin, Paul Menzel.
Rex-BC Chen has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62893 )

Change subject: mb/google/corsola: Revise power-on sequence of PS8640
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Patch Set 8:

(1 comment)

File src/mainboard/google/corsola/display.c:

https://review.coreboot.org/c/coreboot/+/62893/comment/07a2d572_d1adfcb6 
PS6, Line 32: 	mdelay(55);
> Users might want to install upstream firmware themselves with different payloads. But your call. […]

Thanks for suggestion.
I add the power-on sequence and datasheet name in driver comment.