Change in coreboot[master]: soc/intel/alderlake: Add support for external clock buffer

[Subrata Banik (Code Review)]

Attention is currently required from: Furquan Shaikh, Tim Wawrzynczak, Angel Pons, Patrick Rudolph, EricR Lai.
Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/50162 )

Change subject: soc/intel/alderlake: Add support for external clock buffer
......................................................................

Patch Set 1:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/50162/comment/54f4bf04_f495bdfd 
PS1, Line 9: 3 CLKSRC using external clock buffer.
           : CLKSRC 6 provides feed clock to discrete buffer for further
           : distribution to platform.
> Hmmm... […]

Thanks Angel, your understanding is very valid. This part is assume closed.

The only puzzle that i have looks like disabling CLKSRC7:9 is causing device not detecting on RP7. Need to understand