arm64: defconfig: Drop CONFIG_VIDEO_IMX_MEDIA

CONFIG_VIDEO_IMX_MEDIA isn't needed on arm64 platforms since commit
9f257f50 ("media: imx: Unstage the imx7-media-csi driver") which
moved the last arm64 driver depending on that Kconfig symbol out of
staging. Drop it from the arm64 defconfig.

Fixes: 9f257f50 ("media: imx: Unstage the imx7-media-csi driver")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>