feat: add guard in `lfilter` for a non-default cuda device (#3432)

Summary:
Should resolve https://github.com/pytorch/audio/issues/3425

cc mthrok

Pull Request resolved: https://github.com/pytorch/audio/pull/3432

Differential Revision: D46656180

Pulled By: mthrok

fbshipit-source-id: 5c534bee2f143ef5cb5e50ec74828012dbcab7e9

torchaudio/csrc/iir_cuda.cu

 #include <c10/cuda/CUDAException.h>
+#include <c10/cuda/CUDAGuard.h>
 #include <torch/torch.h>
 
 template <typename scalar_t>
@@ -58,6 +59,8 @@ void cuda_lfilter_core_loop(
 
   TORCH_CHECK(in.size(2) + a_flipped.size(1) - 1 == padded_out.size(2));
 
+  const at::cuda::OptionalCUDAGuard device_guard(device_of(in));
+
   const dim3 threads(256);
   const dim3 blocks((N * C + threads.x - 1) / threads.x);