Sync with upstream verilog-mode revision 0d6420b

Sync with upstream verilog-mode revision 0d6420b

* lisp/progmodes/verilog-mode.el (verilog-mode-version): Update.
(vector-skip-list): Remove.
(verilog-auto-inst-port, verilog-auto-inst-port-list)
(verilog-auto-inst, verilog-auto-inst-param):
Use arguments rather than vector-skip.
(verilog-auto-inst-port): Fix AUTOINST interfaces to not show modport
if signal attachment is itself a modport.  Reported by Matthew Lovell.