rtnetlink: add RTNL_FLAG_DUMP_UNLOCKED flag

[ Upstream commit 386520e0 ]

Similarly to RTNL_FLAG_DOIT_UNLOCKED, this new flag
allows dump operations registered via rtnl_register()
or rtnl_register_module() to opt-out from RTNL protection.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 5be2062e ("mpls: Handle error of rtnl_register_module().")
Signed-off-by: Sasha Levin <sashal@kernel.org>