Use size_t for frame size

except in the control block, where we don't have room.

In AudioFlinger::ThreadBase::TrackBase::getBuffer,
read the frame size from control block only once.

Change-Id: Id6c4bccd4ed3e07d91df6bbea43bae45524f9f4e
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index f99e764..cd5f56d 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -536,7 +536,7 @@
                     size_t                  mFrameCount;
                     uint32_t                mChannelMask;
                     uint16_t                mChannelCount;
-                    uint16_t                mFrameSize;
+                    size_t                  mFrameSize;
                     uint32_t                mFormat;
                     Condition               mParamCond;
                     Vector<String8>         mNewParameters;