BpfMapTest: fixes for testGetFd

Test: TreeHugger, atest BpfMapTest happier
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ib2915d48fab2c1e90300f1d4aa5d2cb2f69741f9
diff --git a/tests/mts/bpf_existence_test.cpp b/tests/mts/bpf_existence_test.cpp
index 1dc2e90..e212e7d 100644
--- a/tests/mts/bpf_existence_test.cpp
+++ b/tests/mts/bpf_existence_test.cpp
@@ -69,6 +69,7 @@
     TETHERING "map_test_bitmap",
     TETHERING "map_test_tether_downstream6_map",
     TETHERING "map_test_tether2_downstream6_map",
+    TETHERING "map_test_tether3_downstream6_map",
     TETHERING "prog_offload_schedcls_tether_downstream4_ether",
     TETHERING "prog_offload_schedcls_tether_downstream4_rawip",
     TETHERING "prog_offload_schedcls_tether_downstream6_ether",