clk: qcom: Add sensor clock controller driver for SM6150

Add a sensor clock controller (SCC) driver which can be used
to control sensor clocks on boards in which the application
processor owns these clocks.

Change-Id: I76aa5a35509f7fa48ee4109941caa9b410d7f350
Signed-off-by: Veera Vegivada <vvegivad@codeaurora.org>