AudioFlinger: Split off audio processing library

Test: native AudioResampler test, general playback test
Bug: 31015569
Change-Id: Ifb248f4402a583438d756c014dcd7a4577aef713
diff --git a/media/libaudioprocessing/tests/README b/media/libaudioprocessing/tests/README
new file mode 100644
index 0000000..ed7e2ed
--- /dev/null
+++ b/media/libaudioprocessing/tests/README
@@ -0,0 +1,13 @@
+For libsonic dependency:
+pushd $ANDROID_BUILD_TOP/external/sonic
+mm
+popd
+
+To build audio processing library:
+pushd ..
+Optionally uncomment USE_NEON=false in Android.mk
+mm
+popd
+
+Then build here:
+mm