dt-bindings: Fix incomplete if/then/else schemas

A recent review highlighted that the json-schema meta-schema allows any
combination of if/then/else schema keywords even though if, then or else
by themselves makes little sense. With an added meta-schema to only
allow valid combinations, there's a handful of schemas found which need
fixing in a variety of ways. Incorrect indentation is the most common
issue.

Cc: Lars-Peter Clausen <[email protected]>
Cc: Michael Hennerich <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Olivier Moysan <[email protected]>
Cc: Arnaud Pouliquen <[email protected]>
Cc: Bjorn Andersson <[email protected]>
Cc: Georgi Djakov <[email protected]>
Cc: Ulf Hansson <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Jonathan Hunter <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: Paolo Abeni <[email protected]>
Cc: Kishon Vijay Abraham I <[email protected]>
Cc: Vinod Koul <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Fabrice Gasnier <[email protected]>
Cc: Grygorii Strashko <[email protected]>
Cc: Dmitry Osipenko <[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: Jakub Kicinski <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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