media: dt-bindings: rc: Allow 'ir-receiver' node names

Most existing 'gpio-ir-receiver' nodes use 'ir-receiver' for their node
name, so add it as an allowed node name.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220606184944.1067068-1-robh@kernel.org