In some places we are using "mask" and others "dma_mask" for the
same thing.  Harmonize the various places to "dma_mask" as used in
linux_pci.c.  For the declaration remove the argument names to
avoid the entire problem.

This is in preparation for an upcoming change.
No functional changes intended.

Sponsored by:	The FreeBSD Foundation
MFC after:	5 days