MAINTAINERS: add VT-d entry

Add this entry as suggested by Jason and Michael.

CC: Jason Wang <jasowang@redhat.com>
CC: Michael S. Tsirkin <mst@redhat.com>
CC: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20200701124418.63060-1-peterx@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 5f02160..49a0d83 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2624,6 +2624,15 @@
 F: .gitlab-ci.d/edk2.yml
 F: .gitlab-ci.d/edk2/
 
+VT-d Emulation
+M: Michael S. Tsirkin <mst@redhat.com>
+M: Peter Xu <peterx@redhat.com>
+R: Jason Wang <jasowang@redhat.com>
+S: Supported
+F: hw/i386/intel_iommu.c
+F: hw/i386/intel_iommu_internal.h
+F: include/hw/i386/intel_iommu.h
+
 Usermode Emulation
 ------------------
 Overall usermode emulation