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

This reverts commit b00e66f754d6cfe2c5dcd7dab54a4a86004effd7.

Reason for revert: http://b/135753060

Change-Id: I30f472427f52076b64902420f9538b4a880a2cbe
3 files changed