get rid of OCMEM

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
vivante will be OF only

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
call load_gpu(..) at the end of vivante_load(..)

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>