net: enable memcg accounting for veth queues

[ Upstream commit 961c6136 ]

veth netdevice defines own rx queues and allocates array containing
up to 4095 ~750-bytes-long 'struct veth_rq' elements. Such allocation
is quite huge and should be accounted to memcg.

Signed-off-by: Vasily Averin <vvs@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 1ce7d306 ("veth: try harder when allocating queue memory")
Signed-off-by: Sasha Levin <sashal@kernel.org>