- Fix cards with multiple modules.  Prior to this, the ports on the various   modules would have overlapping names. - Only create /dev/si_control for unit 0.
- Fix cards with multiple modules.  Prior to this, the ports on the various
  modules would have overlapping names.
- Only create /dev/si_control for unit 0.

Tested by:	Joerg Lehners Joerg dot Lehners at informatik dot
		uni-oldenburg dot de (on 6.x)
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