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

This reverts commit c33aee8ac1c0958df32dcd2db27ca3d0d1badbd1.

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