clk: qcom: Add common runtime_pm support

Add common runtime_pm initialization and callback functions to allow
clock providers to vote clocks, interconnects, and regulators in
runtime_suspend and runtime_resume.

Change-Id: I97588feae47016b8375849c5926495c1d73f792d
Signed-off-by: Mike Tipton <mdtipton@codeaurora.org>