Export CAF msm-4.14 audio headers

Change-Id: Idc7def38ad90abf4a62e30b3cec97bcb76696a6d
diff --git a/build/soong/Android.bp b/build/soong/Android.bp
index cbea01f..0a2b968 100644
--- a/build/soong/Android.bp
+++ b/build/soong/Android.bp
@@ -31,6 +31,7 @@
 
     // Directories that can be imported by a cc_* module generated_headers property
     export_include_dirs: [
+        "usr/audio/include/uapi",
         "usr/include",
         "usr/include/audio/include/uapi",
         "usr/techpack/audio/include"