servod: Add enable_ite_dfu and get_ite_chipid commands for Servo Micro.

These commands are only supported on Servo Micro initially, for which they are
thin wrappers around Servo Micro console commands of the same names.

BRANCH=none
BUG=b:79684405
TEST=Both commands run the corresponding Servo Micro console command and print
the complete output.  Repeated tries successfully print the entire output,
never cutting it short.  Also, when the chip ID I2C queries fail and the
console commands print an error, these dut-control commands correctly fail
immediately (without waiting for pexpect timeout).

Change-Id: I8d13bd73a130088d8253d7ebf7854f2d6f747130
Signed-off-by: Matthew Blecker <matthewb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1164482
Reviewed-by: Ruben Rodriguez Buchillon <coconutruben@chromium.org>
2 files changed