Fix the code so that it no longer on alpha refers to the now nonexistent pci_cvt_to_bwx.
Fix the code so that it no longer on alpha refers to the now nonexistent
pci_cvt_to_bwx.

This doesn't necessarily make bge(4) now actually *work* on an alpha.
It loads, configures, and then about 30 seconds later, my XP1000 hard
freezes. But, hey, it's a start.

Obtained from:	gallatin@freebsd.org

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