arm: fix compile failure in mach-shmobile/board-ag5evm.c

Add videodev2 header which provides V4L2_PIX_FMT_RGB565 to fix:

arch/arm/mach-shmobile/board-ag5evm.c:274: error: 'V4L2_PIX_FMT_RGB565' undeclared here (not in a function)
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/arm/mach-shmobile/board-ag5evm.c

@@ -30,6 +30,7 @@
 #include <linux/serial_sci.h>
 #include <linux/smsc911x.h>
 #include <linux/gpio.h>
+#include <linux/videodev2.h>
 #include <linux/input.h>
 #include <linux/input/sh_keysc.h>
 #include <linux/mmc/host.h>