input: touchscreen: synaptics_tcm: Enable pinctrl for touch driver

Incorrect configuration for interrupt gpio leads to VREG_L10A_TS_1P8 0.02
mA~0.05mA leakage in suspend mode. Enable pinctrl and set interrupt gpio
nopull in suspend to fix it.

Change-Id: I5638ce29f8fe9ec0533e894231b925f3973f464c
Signed-off-by: Xin Hua Lu <luxinhua@codeaurora.org>