selftests: net: add config fragments

Add fragments to pass bridge and vlan tests.

Fixes: 33b01b7b4f19 ("selftests: add rtnetlink test script")
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/config

@@ -12,3 +12,5 @@ CONFIG_NET_IPVTI=y
 CONFIG_INET6_XFRM_MODE_TUNNEL=y
 CONFIG_IPV6_VTI=y
 CONFIG_DUMMY=y
+CONFIG_BRIDGE=y
+CONFIG_VLAN_8021Q=y