flash_ec: Save more variables.
flash_ec: Save more variables.

It was found on zoombini, when flashing via flash_ec failed, it would
prevent the board from booting as certain controls were left in their
"flashing" state.  This was because these controls were missing from the
variables list which is what was used to restore the controls.

BUG=b:65694294
BRANCH=None
TEST=Attempt to flash zoombini without the flex connected.  Attach the
servo flex, apply power, verify DUT boots up.

Change-Id: Ic2bc74ef1a61d4f10da6d3ceac77fbd373697838
Signed-off-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@google.com>
Reviewed-on: https://chromium-review.googlesource.com/714023
Commit-Ready: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Tested-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec