msm: clock-8960: Add RPM clocks support in clock driver for 8064

RPM was not avaiable in the initial development so the dummy clocks
were used for them. Now since there is RPM support, just add them
back.

Change-Id: I9c926dc1067b37721e0154055876129045cf1268
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>