dt-bindings: display: Convert common panel bindings to DT schema

Convert the common panel bindings to DT schema consolidating scattered
definitions to a single schema file.

The 'simple-panel' binding just a collection of properties and not a
complete binding itself. All of the 'simple-panel' properties are
covered by the panel-common.txt binding with the exception of the
'no-hpd' property, so add that to the schema.

As there are lots of references to simple-panel.txt, just keep the file
with a reference to common.yaml for now until all the bindings are
converted.

Cc: Thierry Reding <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: [email protected]
Acked-by: Sam Ravnborg <[email protected]>
Reviewed-by: Maxime Ripard <[email protected]>
Reviewed-by: Thierry Reding <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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