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.cpp b/services/audioflinger/AudioResamplerDyn.cpp
index 7ca10c1..043c803 100644
--- a/services/audioflinger/AudioResamplerDyn.cpp
+++ b/services/audioflinger/AudioResamplerDyn.cpp
@@ -162,9 +162,9 @@
 }
 
 template<typename TC, typename TI, typename TO>
-AudioResamplerDyn<TC, TI, TO>::AudioResamplerDyn(int bitDepth,
+AudioResamplerDyn<TC, TI, TO>::AudioResamplerDyn(
         int inChannelCount, int32_t sampleRate, src_quality quality)
-    : AudioResampler(bitDepth, inChannelCount, sampleRate, quality),
+    : AudioResampler(inChannelCount, sampleRate, quality),
       mResampleFunc(0), mFilterSampleRate(0), mFilterQuality(DEFAULT_QUALITY),
     mCoefBuffer(NULL)
 {