ARM: dts: apq: Enable Synaptics Touch Controller for apq8084

APQ8084 MTP and CDP are using Synaptics touch controller. Add in
proper device tree configuration, gpiomux, and clock configuration
to bring up the touch panel.

Change-Id: Iea7a17b1d12204a7456e03c4cca17a8711705f51
Signed-off-by: Chun Zhang <chunz@codeaurora.org>