clk: qcom: dispcc-sm8250: Add sc8180x support

The display clock controller in SC8180x is reused from SM8150, so add
the necessary compatible and wire up the driver to enable this.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210511041719.591969-1-bjorn.andersson@linaro.org
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>