Bip has an I2C mux that we need to set before we can program the ITE8320
chip. Set the dut's i2c mux to pass through to the EC.
BRANCH=none
BUG=b:79533605
TEST=flash bip and reef_it8320
CQ-DEPEND=CL:1054559
Change-Id: I690aa253c757c37dfb276d5be897b92a9aa1545e
Signed-off-by: Jett Rink <jettrink@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1054560
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Nick Sanders <nsanders@chromium.org>