input: synaptics_2.6: add pinctrl support for Synaptics 2.6 driver

Add pinctrl support for Synaptics S2333 controller so that the irq and
pwr pins could be pulled up when probed and resumed. Furthermore, they
should be pulled down when suspended and removed.

Change-Id: If517747243a605eacd1f6ffd6d1f7c0d45d06c1b
Signed-off-by: Changmin Liu <changmil@codeaurora.org>