[media] am437x: include linux/videodev2.h for expanding BASE_VIDIOC_PRIVATE

In am437x-vpfe.h BASE_VIDIOC_PRIVATE is used for
making the name of ioctl command(VIDIOC_AM437X_CCDC_CFG).
The definition of BASE_VIDIOC_PRIVATE is in linux/videodev2.h.
However, linux/videodev2.h is not included in am437x-vpfe.h.
As the result an application using has to include both
am437x-vpfe.h and linux/videodev2.h.

With this patch, the application can include just am437x-vpfe.h.
Signed-off-by: NMasatake YAMATO <yamato@redhat.com>
Acked-by: NLad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

include/uapi/linux/am437x-vpfe.h

@@ -21,6 +21,8 @@
 #ifndef AM437X_VPFE_USER_H
 #define AM437X_VPFE_USER_H
 
+#include <linux/videodev2.h>
+
 enum vpfe_ccdc_data_size {
 	VPFE_CCDC_DATA_16BITS = 0,
 	VPFE_CCDC_DATA_15BITS,