glados: Make SPI chip select a GPIO
glados: Make SPI chip select a GPIO

The mec1322 SPI driver toggles CS manually (CONFIG_SPI_CS_GPIO), so the
pin needs to be a normal GPIO, not functional.

BUG=chrome-os-partner:43160
TEST=Run "flashrom -p internal:bus=lpc -r read.bin" on glados, verify
that read.bin contains actual flash data and not all zeros.
BRANCH=None

Change-Id: Ibaee03b43b4d9c25f6c074c02688d1cba20c7a02
Signed-off-by: Shawn Nematbakhsh <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/288321
Reviewed-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>
Reviewed-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>

fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BZ_DEV_EC,coreboot/chrome-ec,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec