Follow the standard nodename pattern "^interrupt-controller(@[0-9a-f,]+)*$"
defined in schemas/interrupt-controller.yaml of dt-schema.

Otherwise, after the dt-binding is converted to json-schema,
make ARCH=arm dtbs_check' will show warnings like this:

  aidet@5fc20000: $nodename:0: 'aidet@5fc20000' does not match '^interrupt-controller(@[0-9a-f,]+)*$'
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>