vdpa: consume device_features parameter

vdpa: consume device_features parameter

Consume the parameter to device_features when parsing command line
options.  Otherwise the parameter may be used again as an option name.

 # vdpa dev add ... device_features 0xdeadbeef mac 00:11:22:33:44:55
 Unknown option "0xdeadbeef"

Fixes: a4442ce58ebb ("vdpa: allow provisioning device features")
Signed-off-by: Allen Hubbe <allen.hubbe@amd.com>
Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David Ahern <dsahern@kernel.org>