upload android base code part4

android/hardware/libhardware_legacy/audio/Android.bp

@@ -0,0 +1,25 @@
+// Copyright 2011 The Android Open Source Project
+
+//AUDIO_POLICY_TEST := true
+//ENABLE_AUDIO_DUMP := true
+
+cc_library_static {
+
+    srcs: [
+        "AudioHardwareInterface.cpp",
+        "audio_hw_hal.cpp",
+    ],
+
+    name: "libaudiohw_legacy",
+    static_libs: ["libmedia_helper"],
+    cflags: [
+        "-Wno-unused-parameter",
+        "-Wno-gnu-designator",
+    ],
+
+    header_libs: [
+        "libbase_headers",
+        "libhardware_legacy_headers",
+    ],
+    export_header_lib_headers: ["libhardware_legacy_headers"],
+}