[S] Change in coreboot[master]: mb/google/skyrim: Disable unused SPI ROM types

[Tim Van Patten (Code Review)]

Attention is currently required from: Martin L Roth, Jason Nien, Jon Murphy, Martin Roth.

Tim Van Patten has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/72769 )

Change subject: mb/google/skyrim: Disable unused SPI ROM types
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Patch Set 3:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/72769/comment/71a2c780_08453196 
PS3, Line 10: Excluding the unused ROM types shrinks ramstage by almost 4k.
Nice!

File src/mainboard/google/skyrim/Kconfig:

https://review.coreboot.org/c/coreboot/+/72769/comment/b1b44236_1c315e36 
PS3, Line 206: # Gigadevice is used on Whiterun as an alternative to Winbond
             : config SPI_FLASH_GIGADEVICE
             : 	default y
             : 
             : # XMC chips used on Markarth as an alternative to Winbond
             : # These chips identify as ST Micro (Manufacturer ID: 0x20)
             : config SPI_FLASH_STMICRO
             : 	default y
Can these be moved to `skyrim/Kconfig.name` and only enabled for the necessary boards? That would remove the need for the comments describing which boards actually need them.