input: synaptics_dsx: add standard features for touch support

Add standard features to Synaptics V2 driver. The supported
features are -

- Frame buffer(fb) blank/unblank notifications
- Pin control framework for gpios
- Sysfs interface for config id
- Dtsi interface for panel and display resolution

Change-Id: I7b057b09a2f2f1e30fe0ae5f1449282fe06551dd
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>