input: touchpanel: Move Goodix GT915 driver to drivers folder

Goodix GT915 driver was provided by vendor and cherry-picked into
our project, it need to be placed to right location.

Change-Id: Idf191144354426233eca41727a41e26ddbf92f95
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>
Signed-off-by: Pan Fang <fangpan@codeaurora.org>