[S] Change in coreboot[master]: mb/google/rex: Configure EN_DMIC_SOC_DATA to GPO and LOW

[Subrata Banik (Code Review)]

Attention is currently required from: Tarun Tuli, Kapil Porwal, Ivy Jian, Eric Lai.

Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/71631 )

Change subject: mb/google/rex: Configure EN_DMIC_SOC_DATA to GPO and LOW
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Patch Set 1:

(1 comment)

Patchset:

PS1:
> Who will set it high if there is no driver to control it? IIUC, there is no audio drier will control GPIO.

Reading https://b.corp.google.com/issues/263411621#comment3, I felt the audio driver might have some request in future.

For Proto 1

```
Initial Proto1 build configuration will bypass the DMIC gate via jumpers. Enable signal moved to GPP_H15.
```