Strago: Add support for USB-C muxes

Ported the USB-C muxes from Glados
 Change-Id: I9d42108688a9070b982ae77f77633654bc6505ed
 Reviewed-on: https://chromium-review.googlesource.com/282281

BUG=none
TEST=Tested the USB & DP status from "typec" console command.
     Observed usb_mux_set() & usb_mux_get() function are getting called
     and also the polarity of the USB-C is getting detected properly.
BRANCH=none

Change-Id: I0b169032ff77af9895311680413aed6c7d0fd4e2
Signed-off-by: Vijay Hiremath <vijay.p.hiremath@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/287464
Reviewed-by: Shawn N <shawnn@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
3 files changed