dt-bindings: clock: add SM8250 QCOM video clock bindings

Add device tree bindings for video clock controller for SM8250 SoCs.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200923160635.28370-4-jonathan@marek.ca


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