libnbaio: Add libaudioutils headers export

Header files of libnbaio include files from audio_utils
yet the module did not export include path for those. This was
requiring modules depending on libnbaio[_mono] to add those
include paths into their build files.

Test: make
Change-Id: I8982e04db0f3646ce7945fb55529727766f2dfa1

media/audioserver/Android.mk

@@ -35,7 +35,6 @@ LOCAL_C_INCLUDES := \
 	frameworks/av/media/libaaudio/src \
 	frameworks/av/media/libaaudio/src/binding \
 	frameworks/av/media/libmedia \
-	$(call include-path-for, audio-utils) \
 	external/sonic \
 
 # If AUDIOSERVER_MULTILIB in device.mk is non-empty then it is used to control

media/libnbaio/Android.bp

@@ -1,4 +1,3 @@
-
 cc_defaults {
     name: "libnbaio_mono_defaults",
     srcs: [
@@ -21,6 +20,9 @@ cc_defaults {
         "liblog",
         "libutils",
     ],
+    export_shared_lib_headers: [
+        "libaudioutils",
+    ],
 
     export_include_dirs: ["include_mono"],
 }
@@ -66,7 +68,5 @@ cc_library_shared {
         "-Wall",
     ],
 
-    include_dirs: ["system/media/audio_utils/include"],
-
     export_include_dirs: ["include"],
 }