Add 'fbtest' - a command to produce test patterns on a screen Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>