[S] Change in coreboot[master]: soc/intel/broadwell: Clarify PCIe Non Common Clock mode

[Angel Pons (Code Review)]

Angel Pons has restored this change. ( https://review.coreboot.org/c/coreboot/+/58284?usp=email )

Change subject: soc/intel/broadwell: Clarify PCIe Non Common Clock mode
......................................................................

Restored