Move libbluetooth_audio_session out of v2.0 folder

libbluetooth_audio_session must be version agnostic, and support both
2.0 and 2.1 bluetooth.audio vendor libraries

Test: compilation
Bug: 150670922
Change-Id: I487022b28a471960e669b9794808dd53b1bdca17
diff --git a/bluetooth/audio/utils/Android.bp b/bluetooth/audio/utils/Android.bp
new file mode 100644
index 0000000..add822e
--- /dev/null
+++ b/bluetooth/audio/utils/Android.bp
@@ -0,0 +1,20 @@
+cc_library_shared {
+    name: "libbluetooth_audio_session",
+    defaults: ["hidl_defaults"],
+    vendor: true,
+    srcs: [
+        "session/BluetoothAudioSession.cpp",
+        "session/BluetoothAudioSupportedCodecsDB.cpp",
+    ],
+    export_include_dirs: ["session/"],
+    header_libs: ["libhardware_headers"],
+    shared_libs: [
+        "android.hardware.bluetooth.audio@2.0",
+        "libbase",
+        "libcutils",
+        "libfmq",
+        "libhidlbase",
+        "liblog",
+        "libutils",
+    ],
+}