msm: clock-8960: Add support for QDSS RPM clocks

The QDSS clocks are controlled by the RPM. Add support for these
clocks via the standard rpm clock driver so that the QDSS driver
can use standard clock APIs to control clocks.

Change-Id: I184d02d75695c36321cea014b34be30d74e9d5a3
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>