dt-bindings: Improve phandle-array schemas

The 'phandle-array' type is a bit ambiguous. It can be either just an
array of phandles or an array of phandles plus args. Many schemas for
phandle-array properties aren't clear in the schema which case applies
though the description usually describes it.

The array of phandles case boils down to needing:

items:
  maxItems: 1

The phandle plus args cases should typically take this form:

items:
  - items:
      - description: A phandle
      - description: 1st arg cell
      - description: 2nd arg cell

With this change, some examples need updating so that the bracketing of
property values matches the schema.

Signed-off-by: Rob Herring <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Acked-by: Vinod Koul <[email protected]>
Acked-by: Ulf Hansson <[email protected]>
Acked-by: Georgi Djakov <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Acked-by: Mark Brown <[email protected]>
Acked-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Stephen Boyd <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: Marc Kleine-Budde <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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