clk: qcom: Add video clock driver for SM6150

Add support for the video clock controller found on SM6150
based devices. This would allow video device drivers to
probe and control their clocks.

Change-Id: I25ad0aff644b99b6579aab7d49828ed015a731d1
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>