compat_ioctl: move cdrom commands into cdrom.c

There is no need for the special cases for the cdrom ioctls any more now,
so make sure that each cdrom driver has a .compat_ioctl() callback and
calls cdrom_compat_ioctl() directly there.

Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/cdrom/gdrom.c

@@ -518,6 +518,9 @@ static const struct block_device_operations gdrom_bdops = {
 	.release		= gdrom_bdops_release,
 	.check_events		= gdrom_bdops_check_events,
 	.ioctl			= gdrom_bdops_ioctl,
+#ifdef CONFIG_COMPAT
+	.ioctl			= blkdev_compat_ptr_ioctl,
+#endif
 };
 
 static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)