dt-bindings: Drop unnecessary *-supply schemas properties

*-supply properties are always a single phandle, so binding schemas
don't need a type $ref nor 'maxItems'.

A meta-schema check for this is pending once these existing cases are
fixed.

Cc: Jonathan Cameron <[email protected]>
Cc: Dmitry Torokhov <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Acked-by: Sam Ravnborg <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Acked-by: Sakari Ailus <[email protected]>
Acked-by: Lee Jones <[email protected]>
Acked-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring <[email protected]>

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