mb/google/rex/var/rex0: Configure EN_WWAN_PWR GPIO based on CBI

GPP_B17 (aka. EN_WWAN_PWR) should be kept low when the device does not
have a WWAN module.

TEST=Power consumption drops to 0 in S0iX

Change-Id: I95150c20c98b037a47827a7b83e4373c6e9070e3
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78684
Reviewed-by: Sukumar Ghorai <sukumar.ghorai@intel.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

0 files changed, 0 insertions, 0 deletions