Provide damage region for screen recording on Raspberry Pi

When trying to do sceen recording using the screenshooter, no screen data
was ever processed because the rpi-renderer never set the previous frames
damage area.

Update the rpi-renderer to copy the necessary data.

Signed-off-by: Shinya Saito <ssaito@igel.co.jp>
Signed-off-by: Tomohito Esaki <etom@igel.co.jp>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
1 file changed