libchromeos: Remove touchscreen calibration workaround for rush_ryu

This is no longer needed in the latest version of device.

cherry-picked from
https://chromium-review.googlesource.com/#/c/239261/

BUG=chrome-os-partner:32041
TEST=manual on rush_ryu

Change-Id: I70079bdc8f65ee9e6401a3c2839ab38ea5458fcd
Reviewed-on: https://chromium-review.googlesource.com/239941
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Yufeng Shen <miletus@google.com>
Tested-by: Yufeng Shen <miletus@google.com>
1 file changed