dt-bindings: clock: mediatek,mt8188: Add VDO1_DPI1_HDMI clock

Add binding for the HDMI TX clock found in the VDO1 controller.
While at it, also remove the unused CLK_VDO1_NR_CLK.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20250212100342.33618-1-angelogioacchino.delregno@collabora.com


Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>