[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:

(1 comment)

File src/mainboard/google/skyrim/Kconfig:

https://review.coreboot.org/c/coreboot/+/72769/comment/e235fdcd_073cdf26 
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
> While it's possible, my personal preference is that the Kconfig. […]

`skyrim/Kconfig.name` is already being used for device-specific values. For example:

```
config BOARD_GOOGLE_WINTERHOLD
    bool "->  Winterhold"
    select BOARD_GOOGLE_BASEBOARD_SKYRIM
    select SOC_AMD_COMMON_BLOCK_ACPI_DPTC
    select FEATURE_DYNAMIC_DPTC

config BOARD_GOOGLE_FROSTFLOW
    bool "->  Frostflow"
    select BOARD_GOOGLE_BASEBOARD_SKYRIM
    select DRIVERS_GENESYSLOGIC_GL9755
    select FEATURE_TABLET_MODE_DPTC
    select SOC_AMD_COMMON_BLOCK_ACPI_DPTC
```

I agree that it would be good to have a consensus on this, and cleanup whichever file we settle on.