clk: qcom: Add support to register for Dynamic Frequency Switch

Dynamic Frequency switch would at runtime read the clock perf level
registers to identify the frequencies supported for a certain RCG clock.

Change-Id: I36446e440911710fb8d33aaed5a7f79e1965ce7f
Signed-off-by: Taniya Das <tdas@codeaurora.org>
4 files changed