MAINTAINERS: drop AMD IOMMU and Intel VT-d sections

We'd like to thank Kevin, so far the VT-d maintainer, for his past
contributions, while at the same time we'd like to reflect reality as it
has been for quite some time. Have VT-d maintainership (and for symmetry
also AMD IOMMU's) fall back to the maintainers of general x86. This also
brings things in sync with how they are for Arm.

While touching the X86 section also append two so far missing slashes.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>

MAINTAINERS

@@ -220,12 +220,6 @@ F:	xen/drivers/acpi/
 F:	xen/include/acpi/
 F:	tools/libacpi/
 
-AMD IOMMU
-M:	Jan Beulich <jbeulich@suse.com>
-M:	Andrew Cooper <andrew.cooper3@citrix.com>
-S:	Maintained
-F:	xen/drivers/passthrough/amd/
-
 ARGO
 M:	Christopher Clark <christopher.w.clark@gmail.com>
 S:	Maintained
@@ -351,11 +345,6 @@ S:	Odd Fixes
 F:	xen/arch/x86/include/asm/tboot.h
 F:	xen/arch/x86/tboot.c
 
-INTEL(R) VT FOR DIRECTED I/O (VT-D)
-M:	Kevin Tian <kevin.tian@intel.com>
-S:	Supported
-F:	xen/drivers/passthrough/vtd/
-
 IOMMU VENDOR INDEPENDENT CODE
 M:	Jan Beulich <jbeulich@suse.com>
 R:	Roger Pau Monné <roger.pau@citrix.com>
@@ -587,9 +576,11 @@ R:	Wei Liu <wl@xen.org>
 S:	Supported
 L:	xen-devel@lists.xenproject.org
 F:	xen/arch/x86/
+F:	xen/drivers/passthrough/amd/
+F:	xen/drivers/passthrough/vtd/
 F:	xen/include/public/arch-x86/
-F:	xen/include/xen/lib/x86
-F:	xen/lib/x86
+F:	xen/include/xen/lib/x86/
+F:	xen/lib/x86/
 F:	xen/tools/gen-cpuid.py
 F:	tools/firmware/hvmloader/
 F:	tools/firmware/rombios/