xsigo: Fixed Path locking issues

xsigo: Fixed Path locking issues

Orabug: 23514725

Changed xve_put_path to allow condition where caller
holds private lock, priv->lock
Removed path_free function and put all the functionality
in xve_put_path
No need for using scatter-gatter when MTU is less than admin mtu
instead of multicast mtu, as admin MTU is the driving factor for
vnic

Signed-off-by: Pradeep Gopanapalli <pradeep.gopanapalli@oracle.com>
Reviewed-by: sajid zia <szia@oracle.com>
Reviewed-by: Haakon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Asmund Ostvold <asmund.ostvold@oracle.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>