Match (* ... *), return a vl-atts-p.
(vl-parse-attribute-instance &key (tokstream 'tokstream) (config 'config)) → (mv errmsg? value new-tokstream)
Verilog-2005 and SystemVerilog-2012 agree exactly about the
definition of
attribute_instance ::= '(*' attr_spec { ',' attr_spec } '*)'