[XS] Change in coreboot[main]: soc/intel/mtl: Set HDA subsystem ID during FSP-M

[Subrata Banik (Code Review)]

Attention is currently required from: Dinesh Gehlot, Eran Mitrani, Jakub Czapiga, Kapil Porwal, Tarun, Tim Crawford.

Subrata Banik has posted comments on this change by Tim Crawford. ( https://review.coreboot.org/c/coreboot/+/82731?usp=email )

Change subject: soc/intel/mtl: Set HDA subsystem ID during FSP-M
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Patch Set 2:

(2 comments)

Patchset:

PS2: 
@[e-mail] can you please take a look?

Commit Message:

https://review.coreboot.org/c/coreboot/+/82731/comment/5e7cc160_4e2c90af?usp... :
PS2, Line 7:  Set HDA subsystem ID during FSP-M
> We are using FSP d.0.97.10.

This is what we validated SiC_Version_0D.00.A8.20
> Here is cbmem from CB:82609:
> https://gist.github.com/crawfxrd/ac68a26cd6e8392ea4ab7b1f20966919
>
> It does try to set the override SSID for HDA:

Are you saying FSP-S tries to override the HDA SSID ?
> [DEBUG]  PCI: 00:00:1f.3 subsystem <- 1558/a763
> [DEBUG]  PCI: 00:00:1f.3 cmd <- 02
>
> But there is no subsystem detected in Linux:
> $ lspci -s 1f.3 -vnn
> 00:1f.3 Audio device [0403]: Intel Corporation Device [8086:7e28] (rev 20)
>    Flags: bus master, fast devsel, latency 64, IRQ 215, IOMMU group 11
>    Memory at b2830000 (64-bit, non-prefetchable) [size=16K]
>    Memory at bee00000 (64-bit, non-prefetchable) [size=2M]
>    Capabilities: <access denied>
>    Kernel driver in use: snd_hda_intel
>    Kernel modules: snd_hda_intel, snd_sof_pci_intel_mtl