Up the count of busses supported by usbd(8) from 4 to 40.  With the advent of USB2 "duplicate" psuedo busses, it is not at all uncommon for machines to have more than 4 USB busses nowadays.
Up the count of busses supported by usbd(8) from 4 to 40.  With the advent
of USB2 "duplicate" psuedo busses, it is not at all uncommon for machines
to have more than 4 USB busses nowadays.

PR:		bin/81533
Submitted by:	Darren Pilgrim dmp at bitfreak dot org
Approved by:	re (scottl)
MFC after:	1 week

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase