dt-bindings: display: panel: convert truly,nt35597.txt to dt-schema

Convert the Truly NT35597 2K display panel bindings to dt-schema.

The vdispp-supply & vdispn-supply are not marked as required since
in practice they are not defined in sdm845-mtp.dts which is the
only used of these bindings.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20250507-topic-misc-truly-nt35597-yaml-v1-1-bc719ad8dfff@linaro.org


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250507-topic-misc-truly-nt35597-yaml-v1-1-bc719ad8dfff@linaro.org