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: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/omap2/dss/venc.c b/drivers/video/omap2/dss/venc.c
index 43009e5..8e35a5b 100644
--- a/drivers/video/omap2/dss/venc.c
+++ b/drivers/video/omap2/dss/venc.c
@@ -769,10 +769,16 @@
 
 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);
 }