Revert "improved usability of TVM EP"

This reverts commit 816658d.

onnxruntime/__init__.py

@@ -44,15 +44,6 @@
 except ImportError:
     pass
 
-try:
-    # Working between the C++ and Python parts in TVM EP is done using the PackedFunc and Registry classes.
-    # In order to use a Python function in C++ code, it must be registered in the global table of functions.
-    # Registration is carried out through the JIT interface, so it is necessary to call
-    # special functions for registration. To do this, we need to make the following import.
-    import onnxruntime.providers.stvm
-except ImportError:
-    pass
-
 from onnxruntime.capi.onnxruntime_validation import package_name, version, cuda_version
 if version:
     __version__ = version