Change in coreboot[master]: mb/google/dedede/var/cret: Support LTE module

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: Martin Roth, Dtrain Hsu, Henry Sun.
Karthik Ramasubramanian has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/51844 )

Change subject: mb/google/dedede/var/cret: Support LTE module
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Patch Set 5:

(1 comment)

File src/mainboard/google/dedede/variants/cret/gpio.c:

https://review.coreboot.org/c/coreboot/+/51844/comment/e0a20a02_b87078ae 
PS5, Line 19: 	PAD_CFG_GPO(GPP_D0, 1, DEEP),
Is this GPIO being used i.e. does LTE module using the Enable/Disable signal in addition to Full Card Power Off and Reset signals?

I have not seen it used in other boards. Also besides the coreboot configuration, I am not seeing it getting used in Power on and Power off sequencing.