dt-bindings: display/msm: merge SM8250 DPU into SM8150

dt-bindings: display/msm: merge SM8250 DPU into SM8150

Split of the bindings was artificial and not helping - we end up with
multiple binding files for very similar devices thus increasing the
chances of using different order of reg and clocks entries.

Unify DPU bindings of SM8150 and SM8250, because they are the same.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Patchwork: https://patchwork.freedesktop.org/patch/617868/
Link: https://lore.kernel.org/r/20241003-dt-binding-display-msm-merge-v1-2-91ab08fc76a2@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>