Rename AudioPort and PolicyAudioPort accordingly.

Make the file name consistent as the class name.

Test: make
Bug: 135621476
Change-Id: Icbde26fe1798e344c3746f4678db098688456654
diff --git a/media/libaudiofoundation/Android.bp b/media/libaudiofoundation/Android.bp
index c91b79e..643a4ba 100644
--- a/media/libaudiofoundation/Android.bp
+++ b/media/libaudiofoundation/Android.bp
@@ -10,7 +10,7 @@
 
     srcs: [
         "AudioGain.cpp",
-        "AudioPortBase.cpp",
+        "AudioPort.cpp",
         "AudioProfile.cpp",
     ],