Because of internal implementation of one way binder calls, in order to unblock the boot phase, we need to put both the binder call and the filedescriptor in the background thread. Original boot time: 17758.6ms New boot time: 17608.0ms Bug: 130773130 Test: DeviceBootTest.DeviceBootTest#SuccessiveBootTest Change-Id: Ib3524418a387c5902af8139e1b2aee82525b8e04