Moving BT regressions to folder and cleaning up

Placed the BT regressions into a folder and added the teardown_test
function. Changed the bt_power_utils to use the enable/disable
for the bt_utils library.

Test: Done
Bug: None
Change-Id: Iba1b87a049fd8437ca23d8e3d50a7ef95ff6ad3e
3 files changed
tree: ff0031ba4da0bfee246ac77da6af8c60549c5579
  1. acts/
  2. tools/
  3. Android.mk
  4. PREUPLOAD.cfg