Adding bluetooth apex and min_sdk_version

Bug: 206121418
Test: Compile
Change-Id: I59dbd7a2b4758be4b90acfd419112e8b9e259219
diff --git a/audio/aidl/Android.bp b/audio/aidl/Android.bp
index c172674..6a0cfa5 100644
--- a/audio/aidl/Android.bp
+++ b/audio/aidl/Android.bp
@@ -47,6 +47,11 @@
             vndk: {
                 enabled: true,
             },
+            apex_available: [
+                "//apex_available:platform",
+                "com.android.bluetooth",
+            ],
+            min_sdk_version: "31",
         },
     },
     versions: [