dt-bindings: display: Add Arm virtual platforms display

'arm,rtsm-display' is a panel for Arm, Ltd. virtual platforms (e.g. FVP).
The binding has been in use for a long time, but was never documented.

Some users and an example have a 'panel-dpi' compatible, but that's not
needed without a 'panel-timing' node which none of the users have since
commit 928faf5e3e8d ("arm64: dts: fvp: Remove panel timings"). The
example does have a 'panel-timing' node, but it should not for the
same reasons the node was removed in the dts files. So update the
example in arm,pl11x.yaml to match the schema.

Cc: Linus Walleij <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Andre Przywara <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Acked-by: Sam Ravnborg <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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