dt-bindings: clock: Add qualcomm QCM2290 DISPCC bindings

Add device tree bindings for display clock controller on QCM2290 SoCs.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1644432308-21099-1-git-send-email-loic.poulain@linaro.org