oak: power: add the console command "power on/off"
oak: power: add the console command "power on/off"

Add the console command "power on/off" for AP power on/off.

BRANCH=none
BUG=none
TEST=manual
  enter "power on/off" in the ec console to turn AP power on/off.

Change-Id: I16d2af72bc1bf045e7672acd9471dff0a672aff5
Signed-off-by: YH Huang <d2b6e71fb6119e288e33a854f7510c1046bfaea5@mediatek.com>
Reviewed-on: https://chromium-review.googlesource.com/280957
Reviewed-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>

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