[TIR][USMP] further changes for extract buffer info

* removing unnecessary import

Change-Id: I3393187b1a46ca4f368d1a046fab6f2575700769

Author: manupak

python/tvm/tir/usmp/__init__.py

@@ -17,6 +17,5 @@
 # pylint: disable=unused-import, redefined-builtin
 """Namespace for Unified Static Memory Planner"""
 
-from . import transform
 from . import analysis
 from .utils import BufferInfo