dt-bindings: Clean-up undocumented compatible strings

Adding checks for undocumented compatible strings reveals a bunch of
warnings in the DT binding examples. Fix the cases which are typos, just
a mismatch between the schema and the example, or aren't documented at all.
In a couple of cases, fixing the compatible revealed some schema errors
which are fixed.

There's a bunch of others remaining after this which have bindings, but
those aren't converted to schema yet.

Cc: Thierry Reding <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Rob Herring <[email protected]>
Acked-by: Mark Brown <[email protected]>
Acked-by: Stephen Boyd <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: Kishon Vijay Abraham I <[email protected]>
Acked-by: Sebastian Reichel <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Acked-by: Vinod Koul <[email protected]>
Acked-by: Alexandre Belloni <[email protected]>
Acked-by: Alain Volmat <[email protected]>
Acked-by: Jonathan Cameron <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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