[XL] Change in coreboot[master]: soc/intel/xeon_sp/spr: add ACPI code

[Jonathan Zhang (Code Review)]

Attention is currently required from: Patrick Rudolph, Simon Chou, Johnny Lin, Christian Walter, Shuming Chu (Shuming), Arthur Heymans.

Jonathan Zhang has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/71967 )

Change subject: soc/intel/xeon_sp/spr: add ACPI code
......................................................................

Patch Set 13:

(1 comment)

File src/soc/intel/xeon_sp/spr/soc_acpi.c:

https://review.coreboot.org/c/coreboot/+/71967/comment/c0085c01_bc1e96f6 
PS13, Line 387: 	for (uint8_t socket = 0; socket < hob->PlatformData.numofIIO; ++socket) {
> This must be CONFIG_MAX_SOCKET to prevent ACPI errors when not all CPUs are plugged on a multi socke […]

I do not have such a system. I would guess that when not all CPUs are plugged on a multi socket system, the hob->PlatformData.numofIIO should reflect the actual number of CPUs instead of the number of sockets? Should we confirm this with Intel?
IIRC, Johnny has a dual socket ArcherCity CRB with only socket plugged in, and this code works fine for him.