Fix handling of startup_timer_expired

1. The startup_timer needs to be less than
3 sec to allow the wakelock to be held by
the stack and needs to be less than the
BLE_START_TIMEOUT of framework.
2. On expiry of startup_timer, just abort
as there is no proper recovery steps here.

Bug: 129394377
Change-Id: I1a397bab5c88fe7ef8ccbc369897903ee5d0a36a