audiopolicy: fix build issue by going on switching to bp

Bug: 130284799
Test: make

Change-Id: I60d41eaa41564fecdeef6d4cb223a8367883db50
Signed-off-by: François Gaffie <francois.gaffie@renault.com>
diff --git a/services/audiopolicy/Android.bp b/services/audiopolicy/Android.bp
new file mode 100644
index 0000000..a42b89f
--- /dev/null
+++ b/services/audiopolicy/Android.bp
@@ -0,0 +1,5 @@
+cc_library_headers {
+    name: "libaudiopolicymanager_interface_headers",
+    host_supported: true,
+    export_include_dirs: ["."],
+}