input: touchscreen: focaltech: cancel pending resume work

Before initiating trusted touch, cancel any pending
suspend or resume work and wait for already scheduled worker
to finish.

Change-Id: I2a44e4e87eaf544d2190e4c9a125d40d7f9115d7
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>