dt-bindings: display/msm: dsi-controller-main: Add SM8750

dt-bindings: display/msm: dsi-controller-main: Add SM8750

Add DSI controller for Qualcomm SM8750 SoC which is quite different from
previous (SM8650) generation.

It does not allow the display clock controller clocks like "byte" and
"pixel" to be reparented to DSI PHY PLLs while the DSI PHY PLL is not
configured (not prepared, rate not set).  Therefore
assigned-clock-parents are not working here and driver is responsible
for reparenting clocks with proper procedure.  These clocks are now
inputs to the DSI controller device.

Except that SM8750 DSI comes with several differences, new blocks and
changes in registers, making it incompatible with SM8650.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/659609/
Link: https://lore.kernel.org/r/20250618-b4-sm8750-display-v7-2-a591c609743d@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>