Change in coreboot[master]: mb/intel/adlrvp: x4 slot support (SD card support) for Adl-P RVP

[Cliff Huang (Code Review)]

Attention is currently required from: Bora Guvendik, Cliff Huang, Anil Kumar K.
Hello Bora Guvendik, build bot (Jenkins), Cliff Huang, Anil Kumar K,

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

https://review.coreboot.org/c/coreboot/+/63945

to look at the new patch set (#6).

Change subject: mb/intel/adlrvp: x4 slot support (SD card support) for Adl-P RVP
......................................................................

mb/intel/adlrvp: x4 slot support (SD card support) for Adl-P RVP

Use clock src and clock req to 7 for x4 slot.
Remove free running clock setting for clock 6.
Configure gpio for source clock OEB native function going to x4 slot.

BUG=b:233252409
BRANCH=firmware-brya-14505.B

TEST=insert SD AIC to x4 slot. boot to OS and use 'lspci' to check
the device.
ex:
58:00.0 SD Host controller: O2 Micro, Inc. Device 8621 (rev 01)
NOTE: The bus number varies.

Signed-off-by: Cliff Huang 
Change-Id: Iba5d83d133b6ae8cd389ddd971db308170094300
---
M src/mainboard/intel/adlrvp/devicetree.cb
M src/mainboard/intel/adlrvp/early_gpio.c
M src/mainboard/intel/adlrvp/gpio.c
3 files changed, 16 insertions(+), 9 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/45/63945/6