MAINTAINERS: add the iommu list for swiotlb and xen-swiotlb

All other discussions related to the dma mapping interfaces are on the
iommu list, so let's make it the official list for swiotlb and the
second list for xen-swiotlb.

Signed-off-by: Christoph Hellwig <[email protected]>
Acked-by: Konrad Rzeszutek Wilk <[email protected]>

Author: Christoph Hellwig

MAINTAINERS

@@ -13034,7 +13034,7 @@ F:	arch/x86/boot/video*
 
 SWIOTLB SUBSYSTEM
 M:	Konrad Rzeszutek Wilk <[email protected]>
-L:	[email protected].org
+L:	[email protected].org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb.git
 S:	Supported
 F:	lib/swiotlb.c
@@ -14969,6 +14969,7 @@ F:	include/xen/interface/io/vscsiif.h
 XEN SWIOTLB SUBSYSTEM
 M:	Konrad Rzeszutek Wilk <[email protected]>
 L:	[email protected] (moderated for non-subscribers)
+L:	[email protected]
 S:	Supported
 F:	arch/x86/xen/*swiotlb*
 F:	drivers/xen/*swiotlb*