Add protections against queueing a UsbRequest when the underlying UsbDeviceConnection is closed. Bug: 204584366 Test: CTS Verifier: USB Accessory Test & USB Device Test Test: No HWASan use-after-free reports with a test app Change-Id: Ia3a9b10349efc0236b1539c81465f479cb32e02b (cherry picked from commit 1691b54b1fda4239249a3871d2c17ed1ec753061) Merged-In: Ia3a9b10349efc0236b1539c81465f479cb32e02b