video: Provide an API to access video parameters
Create a basic API to provide access to video parameters such as screen size, and to position the cursor on the screen. Also add a prototype for video_display_bitmap() which was missing. Signed-off-by: NStefan Reinauer <reinauer@chromium.org> Signed-off-by: NSimon Glass <sjg@chromium.org> Signed-off-by: NAnatolij Gustschin <agust@denx.de>
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