ctlra: add flush to screen in screen redraw func
ctlra: add flush to screen in screen redraw func

The callback API is now working, re-using the previous get_data()
function to access the pixels from the device driver.

Signed-off-by: Harry van Haaren <6e1296516ee88185cd60d9725251227ece1af74d@gmail.com>

openAVproductions/openAV-Ctlra