arm64: defconfig: Enable VIDEO_IMX_MEDIA

To use a camera, the CSIS and CSI drivers need to be enabled with
VIDEO_IMX_MEDIA.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>