[L] Change in coreboot[main]: google/*: Clean up Kconfg board selection for Google MTK boards

[Yu-Ping Wu (Code Review)]

Attention is currently required from: Felix Singer, Hung-Te Lin, Julius Werner, Yidi Lin.

Yu-Ping Wu has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/79063?usp=email )

Change subject: google/*: Clean up Kconfg board selection for Google MTK boards
......................................................................

Patch Set 2: Code-Review+2

(2 comments)

File src/mainboard/google/corsola/Kconfig:

https://review.coreboot.org/c/coreboot/+/79063/comment/df56a761_7b31c3b8 :
PS1, Line 22: 	select DRIVER_ANALOGIX_ANX7625 if BOARD_GOOGLE_CHINCHOU
> I hope I can still assume that at least Staryu is the variant for all the MIPI boards, though?

Yes we can.
> I think it would be best to just have an explicit list for each instead. I wrote it that way now, let me know what you think.

Agreed. PS2 looks good to me.

File src/mainboard/google/geralt/Kconfig:

https://review.coreboot.org/c/coreboot/+/79063/comment/51494960_aea1c083 :
PS2, Line 74: choice
> I removed the `choice` here because a choice always needs to have a prompt, and these kinds of hardw […]

Fine by me.