Servo V3: Remap fw_wp to gpio.

fw_wp is no longer controlled via i2c rather it is now a gpio: gpio2_2.

However gpio2_2 is not properly labelled in the omap_muxes. So it's
muxfile needs to be hard-coded rather than found automatically. This
change allows muxfile to be properly piped into the gpio wr_rd function.

BUG=chromium:268611
TEST=dut-control with link at desk. FAFT test failed before to set fw_wp
and now the test works and passes.

Change-Id: Id8b233bd2a317eef19805273058c75c1ee78750b
Reviewed-on: https://gerrit.chromium.org/gerrit/64803
Tested-by: Simran Basi <sbasi@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
Commit-Queue: Simran Basi <sbasi@chromium.org>
5 files changed