dt-bindings: clock: add QCOM SM8150 and SM8250 display clock bindings

Add device tree bindings for display clock controller for
Qualcomm Technology Inc's SM8150 and SM8250 SoCs.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> (SM8250)
Link: https://lore.kernel.org/r/20200927190653.13876-2-jonathan@marek.ca


Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>