Use torch/types.h where possible (#3422)

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/3422

Differential Revision: D46558184

Pulled By: mthrok

fbshipit-source-id: a775c4fb193496d9b2bf9db7bee186ee23512b99

torchaudio/csrc/ffmpeg/stream_reader/buffer/unchunked_buffer.h

 #pragma once
-#include <torch/torch.h>
+#include <torch/types.h>
 #include <torchaudio/csrc/ffmpeg/ffmpeg.h>
 #include <torchaudio/csrc/ffmpeg/stream_reader/typedefs.h>
 #include <deque>

torchaudio/csrc/ffmpeg/stream_reader/stream_processor.h

 #pragma once
 
-#include <torch/torch.h>
+#include <torch/types.h>
 #include <torchaudio/csrc/ffmpeg/ffmpeg.h>
 #include <torchaudio/csrc/ffmpeg/stream_reader/post_process.h>
 #include <torchaudio/csrc/ffmpeg/stream_reader/typedefs.h>

torchaudio/csrc/utils.h

 #pragma once
-#include <torch/torch.h>
+#include <torch/types.h>
 
 namespace torchaudio {
 bool is_rir_available();