Change in coreboot[master]: soc/intel/common: Skip sending DISCONNECT IPC command

[Subrata Banik (Code Review)]

Attention is currently required from: Evan Green, Tim Wawrzynczak, Sridhar Siricilla.
Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63932 )

Change subject: soc/intel/common: Skip sending DISCONNECT IPC command
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Patch Set 3:

(1 comment)

File src/soc/intel/common/block/tcss/tcss.c:

https://review.coreboot.org/c/coreboot/+/63932/comment/48faff51_263a4410 
PS2, Line 433: if (ps->prev_sleep_state != ACPI_S3 && ps->prev_sleep_state != ACPI_S4) {
> Yes, S4 and S5 are same. coreboot must send the command in the S4 scenario.  Looks like I missed to update the CL.

so, we are relying on XHCI driver fix for S4 as well.

@Evan, JFYI