clk: qcom: rcg2: Add support for display port clock ops

New display port clock ops supported for display port clocks.

Signed-off-by: Taniya Das <tdas@codeaurora.org>
Link: https://lkml.kernel.org/r/20190731182713.8123-2-tdas@codeaurora.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>