dt-bindings: display: add panel-timing.yaml

Add meta-schema variant of panel-timing and
reference it from panel-common.yaml.

Part of this came form other files with other
licenses - original commits:

commit cc3f414cf2e4 ("video: add of helper for display timings/videomode")
commit 86f46565dff3 ("dt-bindings: display: display-timing: Add property to configure sync drive edge")
commit 9cad9c95d7e8 ("Documentation: DocBook DRM framework documentation")

The original authors acked the license change to:
(GPL-2.0-only OR BSD-2-Clause)

v2:
  - Got OK from original authors for re-license
    Huge thanks for the quick replies!
  - Typo fixes (Oleksandr)
  - Drop -array variant when not needed (Maxime)
  - Replace oneOf:... with enum (Maxime)
  - Drop type from clock-frequency (Rob)
  - Drop "|" when not needed (Rob)

v3:
  - Added comment to acks that are only for the license change
  - Add yaml document terminator "..."
  - Updated description (removed reference to native-mode)

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

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