Add flash_ec support for Glower
Add flash_ec support for Glower

Just so that we can program the EC more conveniently.

BRANCH=None
BUG=chrome-os-partner:35308
TEST=Program a Glower.

Change-Id: Iaba0839c4a5b8dee805f7d31e4049198ce43918f
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@google.com>
Reviewed-on: https://chromium-review.googlesource.com/247142
Tested-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>
Commit-Queue: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>

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