bhyve: Map the MSI-X table unconditionally for passthrough

bhyve: Map the MSI-X table unconditionally for passthrough

It is possible for the PBA to reside in the same page as the MSI-X
table.  And, while devices are not supposed to do this, at least some
Intel wifi devices place registers in a page shared with the MSI-X
table.  To handle the first case we currently map the PBA page using
/dev/mem, and the second case is not handled.

Kill two birds with one stone: map the MSI-X table BAR using the
PCIOCBARMMAP ioctl instead of /dev/mem, and map the entire table so that
accesses beyond the bounds of the table can be emulated.  Regions of the
BAR not containing the table are left unmapped.

Reviewed by:	bz, grehan, jhb
MFC after:	3 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32359