pit: Disable SPI output when AP is suspended
pit: Disable SPI output when AP is suspended

This fixes the problem where the EC consumes too much power during suspend.

BUG=chrome-os-partner:20223
BRANCH=none
TEST=from root shell, 'powerd_suspend'.  1.8V_MICOM should not go up.
  after resume, 'ectool hello' should still work.

Change-Id: I93b781e96bea633419e923a83f1f6d7300ae8c54
Signed-off-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/59474
Reviewed-by: Derek Basehore <fb1ef5d447d8cd53e9e4511d7b18b7cdbb10397f@chromium.org>
Reviewed-by: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>

akappy7/ChromeOS_EC_LED_Diagnostics,alterapraxisptyltd/chromium-ec,thehobn/ec,mtk09422/chromiumos-platform-ec,gelraen/cros-ec,fourier49/BZ_DEV_EC,eatbyte/chromium-ec,longsleep/ec,fourier49/BIZ_EC,eatbyte/chromium-ec,gelraen/cros-ec,akappy7/ChromeOS_EC_LED_Diagnostics,longsleep/ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,eatbyte/chromium-ec,fourier49/BZ_DEV_EC,md5555/ec,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,alterapraxisptyltd/chromium-ec,fourier49/BZ_DEV_EC,coreboot/chrome-ec,md5555/ec,gelraen/cros-ec,mtk09422/chromiumos-platform-ec,akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics,alterapraxisptyltd/chromium-ec,thehobn/ec,alterapraxisptyltd/chromium-ec,thehobn/ec,fourier49/BIZ_EC,gelraen/cros-ec,eatbyte/chromium-ec,coreboot/chrome-ec,longsleep/ec,fourier49/BIZ_EC,fourier49/BZ_DEV_EC,coreboot/chrome-ec,md5555/ec,mtk09422/chromiumos-platform-ec,md5555/ec,longsleep/ec,mtk09422/chromiumos-platform-ec,thehobn/ec