Split nblog off from nbaio

nbaio is an acronym for "non-blocking audio I/O", and nblog means
"non-blocking logger" so nblog does not belong with nbaio.

There are a lot of improvements planned for nblog, and having the
restructuring done will make it clearer as more files are added.

Test: builds OK
Change-Id: Ib28bada2566c1d64bdbe9f5d7a5ce40e080178ef
diff --git a/media/libaudioprocessing/Android.mk b/media/libaudioprocessing/Android.mk
index c850984..da1ecc2 100644
--- a/media/libaudioprocessing/Android.mk
+++ b/media/libaudioprocessing/Android.mk
@@ -24,6 +24,7 @@
     libcutils \
     liblog \
     libnbaio \
+    libnblog \
     libsonic \
     libutils \