staging: Solo6x10: accept WxH >= screen dimentions.

This makes it possible to request full resolution (704x576 or 704x480)
independently of the color system used (PAL or NTSC).

Signed-off-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Ismael Luceno <ismael.luceno@corp.bluecherry.net>