ice: block LAN in case of VF to VF offload

commit 9f699b71 upstream.

VF to VF traffic shouldn't go outside. To enforce it, set only the loopback
enable bit in case of all ingress type rules added via the tc tool.

Fixes: 0d08a441 ("ice: ndo_setup_tc implementation for PF")
Reported-by: Sujai Buvaneswaran <Sujai.Buvaneswaran@intel.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Tested-by: George Kuruvinakunnel <george.kuruvinakunnel@intel.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Liwei Song <liwei.song@windriver.com>