Fix USB device drops caused by VHCI connection close.

This change detects VHCI-initiated connection close and re-attaches Cuttlefish
back to host.

BUG=65160456
Change-Id: Iee9b8ba3f92e8222934b844255ae36c3f6e4cb85

(cherry picked from commit 22d75f2a82caacd106502518606a9d929e633076)
2 files changed