input: touchscreen: cyttsp5: resume from deep sleep

If fail to exit EASYWAKE state, try to send POWER_ON to resume
touch from deep sleep again.

Change-Id: I6f7101af10b9d97d55eb41d02c3cd475d6a6865e
Signed-off-by: Fei Mao <feim1@codeaurora.org>