Revert "Reland "adbd: don't close ep0 until we receive FUNCTIONFS_UNBIND.""

This reverts commit 3997d9f17bfca0fd632c20dc2a57186d2de5b196.

Bug: http://b/135753060
Test: treehugger
Change-Id: Ic83a44e7c8f860a6c044ca20ec81f365a8a6ba4b
3 files changed