I9300: Switch back to the binary camera HAL

Add compatibility libutils symbols required by it, and use it
again. It's much more reliable than the reimplementation

Change-Id: Ic837f4688015a956d635f0cf6b9846c24265a4e1
Camera2: Don't try to cancel focus messages when preview stops

Thanks ricardo (CM) for it

Change-Id: I543f05152e83313870ba236694ac63ed5afefa70