samus_pd: Enable both comparator at the same time
samus_pd: Enable both comparator at the same time

We use window mode to share the non-inverting input of the two
comparators. If COMP1 is not enabled, it causes problem on the operation
of COMP2. Fix this by enabling both comparator at the same time.

BUG=chrome-os-partner:31400
TEST=Reboot PD MCU, and plug into port 1. See SNK_READY state.
BRANCH=None

Change-Id: Icb7e7acdb8a09e094c24839c1d7b398b2c3fb9c0
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/212921
Reviewed-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>

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