ARM: dts: msm: Add clock controller devices for the MSM8974

Add the RPM, GCC, MMSS and LPASS clock controller devices
to the device tree for the 8974. This will allow the clock
drivers to probe these devices and register the necessary
clock tables.

Change-Id: Ic8d2da8a2d84ce2b66d35c5f63b93559b7dea36f
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>