check: Inform about missing ranges

In check_unit_address_vs_reg() warning message already says 'reg _or_
ranges' when reg or ranges are present but unit name is missing.  Add
this message for compatibility to say "reg _or_ ranges" when unit name
is present but neither reg nor ranges are present.

Signed-off-by: Arkadiusz Drabczyk <arkadiusz@drabczyk.org>
Message-Id: <20200308165643.19281-1-arkadiusz@drabczyk.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>