ARM: dts: msm: Add secure touch clocks for msm8994 synaptics

Secure touch functions in the Synaptics touch driver now
control directly the clocks required by the TrustZone touch
driver stack.

Change-Id: Id97ffabbcd2988fbcb61d57ab35d865cd9a0699a
Signed-off-by: Keith Fallows <keithf@codeaurora.org>