dt-bindings: display: convert display-timings to DT schema

Add display-timings.yaml - that references panel-timings.yaml.
display-timings.yaml will be used for display bindings
when they are converted to meta-schema format.

For now the old display-timing.txt points to the new
display-timings.yaml - and all users are left as-is.

v2:
  - Updated native-mode description

v3:
  - Simpler "^timing" pattern (Rob)
  - timing node is of type object (Rob)
  - added display-timings to panel-common.yaml
  - added yaml document terminator "..."

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

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