flash_ec: Save the original servo states
flash_ec: Save the original servo states

When first supporting CCD, it skips saving the original servo states
as some of the controls are not supported in CCD.
https://chromium-review.googlesource.com/344427

But then we customized what controls will be used according to the
servo board type.
https://chromium-review.googlesource.com/572142

So we should save original states again. It helps to restore the
original servo states if it gets interrupted in the middle.

BRANCH=none
BUG=none
TEST=Tried running flash_ec using servo-micro.

Change-Id: I5b873d871d36feed4a0e511ba858db9e093a22be
Signed-off-by: Wai-Hong Tam <04b587fdf5845741a0c5a8b9cd59ca72d73ef8fc@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1020158
Reviewed-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>

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