iommu/amd: Update MAINTAINERS entry

I have no access to my AMD email address anymore. Update
entry in MAINTAINERS to the new address.

Signed-off-by: Joerg Roedel <joro@8bytes.org>

MAINTAINERS

@@ -526,10 +526,10 @@ F:	drivers/video/geode/
 F:	arch/x86/include/asm/geode.h
 
 AMD IOMMU (AMD-VI)
-M:	Joerg Roedel <joerg.roedel@amd.com>
+M:	Joerg Roedel <joro@8bytes.org>
 L:	iommu@lists.linux-foundation.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git
-S:	Supported
+S:	Maintained
 F:	drivers/iommu/amd_iommu*.[ch]
 F:	include/linux/amd-iommu.h