Add RecordThread media.log and deferred deallocation

This change allows a media.log buffer for RecordThread.

Unlike playback threads which stick around forever, the RecordThread comes
and goes for every capture session.  This means that the media.log buffer
for a RecordThread would disappear too, and so was useless.  Now when a
thread exits, it's associated media.log buffer is just marked for deferred
deallocation.  It is only actually freed when the memory is needed.

Other changes:
 - Fix bug in unregistering comparison, it was comparing the wrong pointers
 - Increased size of log area so we can log for RecordThread also

Change-Id: If45d4c03a793b86390a0112ec3acc5d41b2e3635
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 7d39822..148644e 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -4404,6 +4404,7 @@
 #endif
 {
     snprintf(mName, kNameLength, "AudioIn_%X", id);
+    mNBLogWriter = audioFlinger->newWriter_l(kLogSize, mName);
 
     readInputParameters();
 }
@@ -4411,6 +4412,7 @@
 
 AudioFlinger::RecordThread::~RecordThread()
 {
+    mAudioFlinger->unregisterWriter(mNBLogWriter);
     delete[] mRsmpInBuffer;
     delete mResampler;
     delete[] mRsmpOutBuffer;