clk: qcom: Add display clock driver for SM6150

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

Change-Id: I918ff68cd87d61d290a0811e6d92828bc07e03d8
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>