clk: qcom: Add video clock driver for ATOLL

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

Change-Id: Ib852ff32b6bdf8a07ffb9c4fbc3411a089a950cf
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>