flash_ec: support flash ITE over ccd with servod.
flash_ec: support flash ITE over ccd with servod.

flash_ec now can program ITE EC in CCD mode with servod.
Same command line can be used either for servo_v2 or Suzy-Q.

CQ-DEPEND=CL:1479874, CL:1481974
BUG=b:124388894
BRANCH=none
TEST=manually ran on Bip and DragonEgg.
[servod launch]
[BIP]
sudo servod -b octopus_ite
./util/flash_ec --board=bip --image ${IMG_BIP}    # suzy-q
./util/flash_ec --board=bip --image ${IMG_BIP}    # servo_v2

[DRAGONEGG]
sudo servod -b dragonegg            # for dragonegg
./util/flash_ec --board=dragonegg --image ${IMG_DRA} # suzy-q
./util/flash_ec --board=dragonegg --image ${IMG_DRA} # servo_v2

Change-Id: I78abfd6b7c07c0cdcaa75fd67580e14797f49d67
Signed-off-by: Namyoon Woo <e8732cefb861f07768f47df788a8e8eb75efc09a@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1481829
Commit-Ready: ChromeOS CL Exonerator Bot <fa429e5907f00867f797423aea74327bb02c91b6@appspot.gserviceaccount.com>
Reviewed-by: Matthew Blecker <d18f4466f2802f9c78c5c14a42b8c21fdbfabfcd@chromium.org>

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