iommu/amd: Remove device binding reference count

This reference count is not used anymore, as all devices in
an alias group are now attached and detached together.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2014-08-05 17:34:25 +02:00
commit cafd2545cf