Fix some broken tests in frameworks-net with native dependencies

Exempt-From-Owner-Approval: Android.mk uses per-file permission to let
the build team modify it without dependeing on us. However because this
rule overrides the directory default owners, Android core networking is
not owner anymore. This exemption is necessary to let Android core
networking team fix their build file.

Test: All tests in runtest frameworks-net pass.
Merged-In: Ie0b8baa38ca39e92fbd698ebcead86dac0a67708

(cherry picked from commit 99e8ab6e46eec5dbd1b059b3732672d537b3cf34)

Change-Id: I4471a5cd7f20852645f3d94684cc5aeef3324162
diff --git a/tests/net/Android.mk b/tests/net/Android.mk
index e4bf590..677585c 100644
--- a/tests/net/Android.mk
+++ b/tests/net/Android.mk
@@ -53,6 +53,7 @@
     libtinyxml2 \
     libvintf \
     libhwbinder \
+    libunwindstack \
     android.hidl.token@1.0
 
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk