Change in coreboot[master]: mb/google/brya/var/primus{4es}: add eMMC enable pin in ramstage

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Paul Menzel, Casper Chang.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62703 )

Change subject: mb/google/brya/var/primus{4es}: add eMMC enable pin in ramstage
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Patch Set 6: Code-Review+2

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/62703/comment/47d5ccb2_4cbee47d 
PS6, Line 9: Program the BayHub eMMC enable pin in ramstage to prevent baseboard
           : override the setting leads RTD3 not able to control when enter and
           : exit suspend state.
suggestion:
```
Currently the BayHub eMMC enable pin is using the default
configuration from the baseboard, which leads to RTD3 not being
able to control the GPIO when exiting and entering suspend. To fix
this, program the GPIO in the ramstage GPIO table.
```