input: touchpanel: Goodix GT915 driver cleanup

Code clean up that makes the driver more like a linux driver.
Add some error recovery to make sure driver will not crash when
error is occurs.

Change-Id: I3af425f5f0251ec576168f72a2059f85c3be4358
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>