dt-bindings: display/msm: hdmi: add qcom,hdmi-tx-8998

HDMI TX block embedded in the APQ8098.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Marc Gonzalez <mgonzalez@freebox.fr>
Patchwork: https://patchwork.freedesktop.org/patch/605638/
Link: https://lore.kernel.org/r/20240724-hdmi-tx-v7-2-e44a20553464@freebox.fr


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>