Fix a long standing bug in programming station address for Yukon controllers. sk(4) never reprogrammed station address for Yukon controllers so overriding station address with ifconfig(8) was not possible. Fix the bug by reprogramming all registers that control station address, flow-control and virtual station address. Virtual station address has no use at this moment since driver does not make use of fail over feature.
Fix a long standing bug in programming station address for Yukon
controllers. sk(4) never reprogrammed station address for Yukon
controllers so overriding station address with ifconfig(8) was not
possible.
Fix the bug by reprogramming all registers that control station
address, flow-control and virtual station address. Virtual station
address has no use at this moment since driver does not make use of
fail over feature.

Tested by:	"Mikhail T." <mi+thun <> aldan.algebra.com>
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