[XS] Change in coreboot[master]: ec/google/chromeec: Use mux_conn to get the right USB port

[Kapil Porwal (Code Review)]

Attention is currently required from: Boris Mittelberg, Caveh Jalali, Eric Lai, Tarun Tuli, Tim Wawrzynczak.

Kapil Porwal has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/75824?usp=email )

Change subject: ec/google/chromeec: Use mux_conn to get the right USB port
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Patch Set 2:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/75824/comment/90677a31_831b894a :
PS2, Line 9: get_usb_port_references
> Search through the devicetree for matching USB Type-C ports, will always report the port by device t […]

check the below code in `get_usb_port_references` -

```
    	int group_token;
    	if (config->use_custom_pld)
    		group_token = config->custom_pld.group.token;
    	else
    		group_token = config->group.token;
    	if (group_token != (port_number + 1))
    		continue;
```

I think current PLD for Type-A port `ACPI_PLD_TYPE_A(RIGHT, RIGHT, ACPI_PLD_GROUP(1, 2))` is causing this issue. Could you please try https://review.coreboot.org/c/coreboot/+/75911 ?