samus: Remove WWAN GPIO by default
samus: Remove WWAN GPIO by default

Leave this rail off by default to help with EMI.

BUG=chrome-os-partner:34117
BRANCH=samus
TEST=build and boot on samus

Change-Id: I6a2aa7da0acd86636aa9421891959e76b6c37415
Signed-off-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/234405
Reviewed-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>

fourier49/BIZ_EC,mtk09422/chromiumos-platform-ec,fourier49/BZ_DEV_EC,fourier49/BIZ_EC,md5555/ec,eatbyte/chromium-ec,fourier49/BIZ_EC,coreboot/chrome-ec,coreboot/chrome-ec,eatbyte/chromium-ec,fourier49/BZ_DEV_EC,coreboot/chrome-ec,md5555/ec,coreboot/chrome-ec,mtk09422/chromiumos-platform-ec,mtk09422/chromiumos-platform-ec,fourier49/BZ_DEV_EC,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,mtk09422/chromiumos-platform-ec,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,eatbyte/chromium-ec,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,eatbyte/chromium-ec