clk: qcom: add SM8550 DISPCC driver

Add support for the display clock controller found in SM8550
based devices.

This clock controller feeds the Multimedia Display SubSystem (MDSS).
This driver is based on the SM8450 support.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230103-topic-sm8550-upstream-dispcc-v3-3-8a03d348c572@linaro.org