[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:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/82731/comment/99bc2676_3ae56fea?usp... :
PS2, Line 7:  Set HDA subsystem ID during FSP-M
Please check fill_fsps_pci_ssid_params(), I believe it solves the same purpose and it is still getting called before FSP-S.

```

/*
 * Programming SSID before FSP-S is important because SSID registers of a few PCIE
 * devices (e.g. IPU, Crashlog, XHCI, TCSS_XHCI etc.) are locked after FSP-S hence
 * provide a custom SSID (same as DID by default) value via UPD.
 */

```