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Even though we are primarily using the UMP buffer obtained by the
GET_UMP_SECURE_ID_SUNXI_FB ioctl, another UMP buffer obtained by
the GET_UMP_SECURE_ID_BUF1 ioctl should also span over the whole
framebuffer. Otherwise we may have troubles with the window resize
bug recovery and buffer flipping.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>