Change in coreboot[master]: mb/google/brya/var/primus{4es}: add enable pin to rtd3-cold

[Casper Chang (Code Review)]

Attention is currently required from: Casper Chang.
Hello build bot (Jenkins), Tim Wawrzynczak,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/62586

to look at the new patch set (#3).

Change subject: mb/google/brya/var/primus{4es}: add enable pin to rtd3-cold
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mb/google/brya/var/primus{4es}: add enable pin to rtd3-cold

Currently the BayHub eMMC controller is only going into its reset
state when the RTD3 sequence is initiated. This causes it to
still consume too much power in suspend states. This CL adds the
power enable GPIO into the RTD3 sequence as well, which will turn
off the eMMC controller (a true D3cold state) during the RTD3
sequence.

BUG=b:222436260
TEST=USE="project_primus" emerge-brya coreboot chromeos-bootimage
     test suspend stress 100 cycles passed on primus.

Signed-off-by: Casper Chang 
Change-Id: I2fec6a30707fb1a258cdcc73b0ce38252b6f77c8
---
M src/mainboard/google/brya/variants/primus/overridetree.cb
M src/mainboard/google/brya/variants/primus4es/overridetree.cb
2 files changed, 2 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/86/62586/3