Changes

Fix lint errors: don't use star imports

tests/test_tlv.py:21:1: F403 `from osmocom.tlv import *` used; unable to detect undefined names
   |
19 | import unittest
20 | from construct import Int8ub, GreedyBytes
21 | from osmocom.tlv import *
   | ^^^^^^^^^^^^^^^^^^^^^^^^^ F403
22 | from osmocom.utils import h2b

Change-Id: I0ca76a40d47f72635682de9303ff73e9b2197266