This adds support for using the libpciaccess interface for
vga arbitration support on top of a kernel which supports it.

Currently patches are queued for kernel 2.6.32 in jbarnes
pci tree, and shipping in Fedora kernel.

Co-authors:
Tiago Vignatti <tiago.vignatti@nokia.com>

Signed-off-by: Dave Airlie <airlied@redhat.com>