msm: clock-8974: Add support for QDSS RPM clocks.

Add support for the QDSS clocks on the 8974. These clocks
are controlled by the RPM; represent them as standard RPM
clocks in the 8974 clock driver, allowing the QDSS driver
to use clock APIs to control them.

Change-Id: I4737112f1e778872a2da4694956c9849c37a6afe
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>