Change in coreboot[master]: soc/intel/alderlake: Add Kconfig for ADL_N PCH

[Angel Pons (Code Review)]

Attention is currently required from: Reka Norman, Maulik V Vaghela, Paul Menzel, Rizwan Qureshi, Subrata Banik, Sridhar Siricilla, Krishna P Bhat D, Usha P, Patrick Rudolph, Kangheui Won.
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/59751 )

Change subject: soc/intel/alderlake: Add Kconfig for ADL_N PCH
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Patch Set 2:

(2 comments)

Patchset:

PS2: 
I'd prefer to squash this change into CB:59752 for simplicity.

File src/soc/intel/alderlake/Kconfig:

https://review.coreboot.org/c/coreboot/+/59751/comment/ea6a9b8f_47f280b6 
PS2, Line 6: config SOC_INTEL_ALDERLAKE_PCH_M
           : 	bool
           : 	help
           : 	  Choose this option if you have PCH-M chipset.
           : 
           : config SOC_INTEL_ALDERLAKE_PCH_N
           : 	bool
           : 	help
           : 	  Choose this option if you have PCH-N chipset.
I'd like to have Kconfig options for all ADL PCH-x types. Besides these two, there's also PCH-P, which is currently chosen by omission (when not explicitly choosing any other PCH variant). I've made CB:59804 to implement this idea.