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

[Tim Crawford (Code Review)]

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

Tim Crawford 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
......................................................................

Patch Set 2:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/82731/comment/e4aad3a4_45600696?usp... :
PS2, Line 7:  Set HDA subsystem ID during FSP-M
> > We see no SSID reported in `lspci -s 0:1f. […]

We are using FSP d.0.97.10.

Here is cbmem from CB:82609:

- https://gist.github.com/crawfxrd/ac68a26cd6e8392ea4ab7b1f20966919

It does try to set the override SSID for HDA:

```
[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
```