Replace int bitDepth with audio_format_t in Resampler

Remove mBitDepth from class (not used).
Replace with audio_format_t in factory method to distinguish
between float and pcm 16-bit.

Change-Id: I166860796c68285077ef4458d8758d19b82523f9
diff --git a/services/audioflinger/AudioResamplerDyn.h b/services/audioflinger/AudioResamplerDyn.h
index 3dced8a..3044bfb 100644
--- a/services/audioflinger/AudioResamplerDyn.h
+++ b/services/audioflinger/AudioResamplerDyn.h
@@ -41,7 +41,7 @@
 template<typename TC, typename TI, typename TO>
 class AudioResamplerDyn: public AudioResampler {
 public:
-    AudioResamplerDyn(int bitDepth, int inChannelCount,
+    AudioResamplerDyn(int inChannelCount,
             int32_t sampleRate, src_quality quality);
 
     virtual ~AudioResamplerDyn();