Change in coreboot[master]: soc/intel/alderlake: add support for external source clock

[Cliff Huang (Code Review)]

Attention is currently required from: Bora Guvendik, Cliff Huang, Jeremy Compostella, Subrata Banik, Tim Wawrzynczak.
Cliff Huang has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63943 )

Change subject: soc/intel/alderlake: add support for external source clock
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Patch Set 6:

(5 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/63943/comment/7c9b15ec_41a8b22a 
PS6, Line 9: includingsource
> missing space.

Done

File src/soc/intel/alderlake/Kconfig:

https://review.coreboot.org/c/coreboot/+/63943/comment/2b14f830_2fdb5630 
PS6, Line 239: 	default 10 if SOC_INTEL_ALDERLAKE_PCH_P
> Why do you change the line ? Couldn't you just change the value ?

Change was done to the same line, but SOC_INTEL_ALDERLAKE_PCH_S got merged then.

https://review.coreboot.org/c/coreboot/+/63943/comment/e1be5844_be51a0e7 
PS6, Line 241: 3
> three

Done

https://review.coreboot.org/c/coreboot/+/63943/comment/638630dd_1c8f28c0 
PS6, Line 241: clock
> clocks

Done

https://review.coreboot.org/c/coreboot/+/63943/comment/a6ac3ecb_8417f863 
PS6, Line 242: This done
> This is done

Done