ectool: flashpd: Reboot PD after successful RW flash
ectool: flashpd: Reboot PD after successful RW flash

Reboot the PD device after a successful flash so that it will boot into
the new RW. This syncs the ectool PD update to the implementation in
flash_pd.py.

BUG=chrome-os-partner:31361
TEST="./ectool --name=cros_pd flashpd 0 1 ec.RW.bin", verify flashing
succeeds and PD is rebooted after flash.
BRANCH=samus

Change-Id: I14e7dffe59fcc7ca678c76890dbc825df5b19862
Signed-off-by: Shawn Nematbakhsh <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/223062
Reviewed-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>

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