Change in coreboot[master]: mb/starlabs/labtop: Enable I2C4

[Angel Pons (Code Review)]

Attention is currently required from: Sean Rhodes.
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/60264 )

Change subject: mb/starlabs/labtop: Enable I2C4
......................................................................

Patch Set 1: Code-Review+2

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/60264/comment/5f485688_522c424b 
PS1, Line 9: Enable I2C4 to allow for proper enumeration but avoid FSP configuring it.
nit: The period goes past the 72-char line length limit. Also, it would be good to explain why I2C4 needs to be enabled:

Enable unused I2C4 PCI device (00:19.0) so that UART2 (00:19.2) can be
 enumerated properly, using `PchSerialIoSkipInit` to prevent FSP-S from
 configuring anything regarding I2C4 (e.g. GPIOs).