Refactor Tuner VTS dvr and descrambler test implementation

Note that we are not testing them right now
Test entry will be implemented or uncomment in next Tuner develop phase

Test: cuttlefish + vendor device
Bug: 135708935
Change-Id: Iea72bd54c85105f74133c67433bd51f8fd07f28d
(cherry picked from commit fc7cc15e)