tests/util: Add simpledrm driver

Add an entry for the "simpledrm" driver, so that the test utilities
work with the simpledrm driver without passing the -M argument.

Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Eric Curtin <ecurtin@redhat.com>

tests/util/kms.c

@@ -123,6 +123,7 @@ static const char * const modules[] = {
 	"komeda",
 	"imx-dcss",
 	"mxsfb-drm",
+	"simpledrm",
 };
 
 int util_open(const char *device, const char *module)