Fix this:
  drivers/video/mb862xx/mb862xx-i2c.c: In function 'mb862xx_i2c_wait_event':
  drivers/video/mb862xx/mb862xx-i2c.c:25: error: implicit declaration of function 'udelay'
caused by commit 
f8a6b1f44833 ("video: mb862xx: add support for
controller's I2C bus adapter").
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 #include <linux/fb.h>
 #include <linux/i2c.h>
 #include <linux/io.h>
+#include <linux/delay.h>
 
 #include "mb862xxfb.h"
 #include "mb862xx_reg.h"