Change in coreboot[master]: soc/intel/alderlake: Add support for ADL-N PCH

[Usha P (Code Review)]

Attention is currently required from: Reka Norman, Maulik V Vaghela, Paul Menzel, Rizwan Qureshi, Subrata Banik, Angel Pons, Krishna P Bhat D, Patrick Rudolph, Kangheui Won.
Usha P has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/59752 )

Change subject: soc/intel/alderlake: Add support for ADL-N PCH
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Patch Set 4:

(5 comments)

Commit Message:

PS2:
> I'd squash CB:59751 into this change. […]

Ack

https://review.coreboot.org/c/coreboot/+/59752/comment/67916f75_e7ada22d 
PS2, Line 7: Configure 9 I/O for ADL-N
> don't able to follow what is `9` here. […]

Ack

https://review.coreboot.org/c/coreboot/+/59752/comment/052aecd8_5a8c7b7b 
PS2, Line 7: soc/intel/alderlake: Configure 9 I/O for ADL-N
> Please clarify number 9. […]

Ack

https://review.coreboot.org/c/coreboot/+/59752/comment/75e1ef56_e0ceebfe 
PS2, Line 9: Select number of I/O based on PCH for Alder Lake-N
> Please elaborate the changes like what are different port supported such as 9 PCIe root ports, 5 Clk […]

Ack

File src/soc/intel/alderlake/Kconfig:

https://review.coreboot.org/c/coreboot/+/59752/comment/d8f38461_6f0d9781 
PS2, Line 177: default
> Please take a look into this  […]

Ack