clk: msm : Add clock-gcc-8952 driver snapshot

This is a snapshot of the clock-gcc-8952 driver as of
msm-3.10 commit: 08b9de57b174f67c6a2b99fb5261e97dd63e73f9
(" clk: qcom: clock-gcc-8952: Enable RPM DCVS after RPM clock votes")

Change-Id: I3df763e837184a21dc4697143977cb1a9c3fbed6
Signed-off-by: Jaydeep Sen <jsen@codeaurora.org>