ARM: mm: Remove unused arm_vmregion priv field

Commit e9da6e99 ("ARM: dma-mapping:
remove custom consistent dma region") removed the last users of the
field. Remove it.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

arch/arm/mm/vmregion.h

@@ -17,7 +17,6 @@ struct arm_vmregion {
 	struct list_head	vm_list;
 	unsigned long		vm_start;
 	unsigned long		vm_end;
-	void			*priv;
 	int			vm_active;
 	const void		*caller;
 };