Freeze neuralnetworks AIDL version as v2 for FL6

$ m android.hardware.neuralnetworks-update-api
$ m android.hardware.neuralnetworks-freeze-api

Bug: 203055646

Test: NeuralNetworksTest_static
Test: VtsHalNeuralnetworksTargetTest
Change-Id: I35dbd32695acdffc552790dc7396bc8c724e9242
diff --git a/neuralnetworks/aidl/Android.bp b/neuralnetworks/aidl/Android.bp
index 3a69936..065105a 100644
--- a/neuralnetworks/aidl/Android.bp
+++ b/neuralnetworks/aidl/Android.bp
@@ -35,5 +35,8 @@
             min_sdk_version: "30",
         },
     },
-    versions: ["1"],
+    versions: [
+        "1",
+        "2",
+    ],
 }