Allow HAL test to pass without instance found.

Bug: 162052785
Test: atest
Change-Id: I03c434cdf357dc8340b107fed991389a47febfbe
diff --git a/bluetooth/a2dp/1.0/vts/functional/VtsHalBluetoothA2dpV1_0TargetTest.cpp b/bluetooth/a2dp/1.0/vts/functional/VtsHalBluetoothA2dpV1_0TargetTest.cpp
index 44b138a..f7fdf31 100644
--- a/bluetooth/a2dp/1.0/vts/functional/VtsHalBluetoothA2dpV1_0TargetTest.cpp
+++ b/bluetooth/a2dp/1.0/vts/functional/VtsHalBluetoothA2dpV1_0TargetTest.cpp
@@ -107,4 +107,6 @@
     PerInstance, BluetoothA2dpHidlTest,
     testing::ValuesIn(android::hardware::getAllHalInstanceNames(
         IBluetoothAudioOffload::descriptor)),
-    android::hardware::PrintInstanceNameToString);
\ No newline at end of file
+    android::hardware::PrintInstanceNameToString);
+
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(BluetoothA2dpHidlTest);