wandboard-quad: Add Wandboard Quad support

Change-Id: I5364de1e40d939865fc8a939825d52255e33f505
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
broadcom-nvram-config: Add wandboard-quad as compatible machine

Change-Id: Ib3e6730d0ba9462a8aeeefcc592f7307d601efab
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>