SystemServer: Align timeout with stack timeout

The Bluetooth stack is starting with a 4second timeout, we should align
the timer in the system server to match
(See com.android.bluetooth.btservice.AdapterState.java)

Bug: 342484285
Test: None
Flag: Exempt increasing timeout only
Change-Id: Icb8ef5ba574fe52436195f695864b3b6f94b351d