imx6qsabrelite: Add the machine in the MACHINEOVERRIDES

The machine needs to be included in the overrides list or
COMPATIBLE_MACHINE matching fails badly.

Change-Id: I52d717dd667c52cb3844c99fdfe25ab0c0c185d6
Reported-by: Omar Pighi <pighi@selea.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>