Use audio_source_t consistently

Was a mix of audio_source_t, uint8_t, and int.

Related fixes:
 - fix comments in MediaRecorder.java
 - AudioPolicyService server side was not checking source parameter at
   all, so if the client wrapper was bypassed, invalid values could be
   passed into audio HAL
 - JNI android_media_AudioRecord_setup was checking source for positive
   values, but not negative values. This test is redundant, since already
   checked at Java and now checked by AudioPolicyService also, but might
   as well make it correct.

Change-Id: Ie5e25d646dcd59a86d7985aa46cfcb4a1ba64a4a
diff --git a/include/media/IAudioPolicyService.h b/include/media/IAudioPolicyService.h
index 07d17c5..4d88297 100644
--- a/include/media/IAudioPolicyService.h
+++ b/include/media/IAudioPolicyService.h
@@ -60,7 +60,7 @@
                                 audio_stream_type_t stream,
                                 int session = 0) = 0;
     virtual void releaseOutput(audio_io_handle_t output) = 0;
-    virtual audio_io_handle_t getInput(int inputSource,
+    virtual audio_io_handle_t getInput(audio_source_t inputSource,
                                     uint32_t samplingRate = 0,
                                     audio_format_t format = AUDIO_FORMAT_DEFAULT,
                                     uint32_t channels = 0,