dt-bindings: More use 'enum' instead of 'oneOf' plus 'const' entries

'enum' is equivalent to 'oneOf' with a list of 'const' entries, but 'enum'
is more concise and yields better error messages.

Fix a couple more cases which have appeared.

Cc: Rob Clark <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Wim Van Sebroeck <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Jonathan Marek <[email protected]>
Cc: Aswath Govindraju <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Rob Herring <[email protected]>
Acked-by: Guenter Roeck <[email protected]>
Acked-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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