Revert "adb: close ep0 on disconnection." am: 8c4076295e am: e780adf0fe
am: 1a60c1a8cf

* commit '1a60c1a8cfb9425647e3846ae2075c10e3f31db6':
  Revert "adb: close ep0 on disconnection."

Change-Id: I06fc08458ff7f8fa70549417a2c89c8b24d147d2