V4L/DVB (13343): v4l: add more missing linux/sched.h includes

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/mx3_camera.c b/drivers/media/video/mx3_camera.c
index dff2e5e..7db82bd 100644
--- a/drivers/media/video/mx3_camera.c
+++ b/drivers/media/video/mx3_camera.c
@@ -17,6 +17,7 @@
 #include <linux/clk.h>
 #include <linux/vmalloc.h>
 #include <linux/interrupt.h>
+#include <linux/sched.h>
 
 #include <media/v4l2-common.h>
 #include <media/v4l2-dev.h>