HACK: OMAP: DSS2: VENC: disable VENC on OMAP4 to prevent crash

Something seems to be wrong with OMAP4 & VENC, and register access fails
in omap_venchw_probe().

This patch skips venc driver registration on OMAP4, thus circumventing
the problem for now.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/venc.c

@@ -769,10 +769,16 @@ static struct platform_driver omap_venchw_driver = {
 
 int venc_init_platform_driver(void)
 {
+	if (cpu_is_omap44xx())
+		return 0;
+
 	return platform_driver_register(&omap_venchw_driver);
 }
 
 void venc_uninit_platform_driver(void)
 {
+	if (cpu_is_omap44xx())
+		return;
+
 	return platform_driver_unregister(&omap_venchw_driver);
 }