USB: Gadget: Add support for pinctrl framework

As the newer targets will be using pinctrl framework for gpio
configuration, our drivers need to be compatible with both set of targets
the one which do not use pinctrl and one which do. Add support for both
these cases. ci13xxx driver can configure wake gpio.

Change-Id: Ibd73b5cd9e8dc38b7d306002c4a5a97b24daa2cd
Signed-off-by: Tarun Gupta <tarung@codeaurora.org>