We are removing VB related functionalities from release tools. This
change removes the hashtreeinfo and generator in verity_utils.py. It
also clears the function args using it.
Bug: 241044073
Test: atest under build/make
Change-Id: Icc298256be6917ffbd40cf4735f8e8092b541c9f
This helps to break the circular dependency between common and
blockimgdiff.
Bug: 32379627
Test: unit tests pass
Change-Id: I90b5ff34782acbfac86f36265bd96c207d898bf6