Remove outdated comment (#874)

Author: scotts

src/torchcodec/_core/DeviceInterface.h

@@ -17,14 +17,6 @@
 
 namespace facebook::torchcodec {
 
-// Note that all these device functions should only be called if the device is
-// not a CPU device. CPU device functions are already implemented in the
-// SingleStreamDecoder implementation.
-// These functions should only be called from within an if block like this:
-// if (device.type() != torch::kCPU) {
-//   deviceFunction(device, ...);
-// }
-
 class DeviceInterface {
  public:
   DeviceInterface(const torch::Device& device) : device_(device) {}