media: imx7-media-csi: drop unused module alias

The driver has never supported anything but OF probing so drop the
unused platform module alias.

Signed-off-by: Johan Hovold <[e-mail]>
Reviewed-by: Frank Li <[e-mail]>
Acked-by: Rui Miguel Silva <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/platform/nxp/imx7-media-csi.c

···
 MODULE_DESCRIPTION("i.MX7 CSI subdev driver");
 MODULE_AUTHOR("Rui Miguel Silva <[e-mail]>");
 MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:imx7-csi");