Add a program feature so we can upload and run programs for lightbar
sequences. We should be able to use this to shift sequences out of the
EC and save space there.

  $ cat <suitable program bin> > /sys/devices/.../cros_ec/program
  $ echo program > /sys/devices/.../cros_ec/sequence
Signed-off-by: NEric Caruso <ejcaruso@chromium.org>
Signed-off-by: NGuenter Roeck <groeck@chromium.org>
Signed-off-by: NEnric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NBenson Leung <bleung@chromium.org>