input: atmel_maxtouch_ts: add support for standard features

Add support for following features to touch controller driver

- xvdd regulator
- i2cmode gpio
- pin control framework
- early suspend
- frame buffer notifications

Change-Id: Ib8338351dfd4927c33bf0ed383dd0d550a3d6e46
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>