MAINTAINERS: add myself as x86 I/O emulation and viridian maintainer

I have made many modifications to this code over the past few years
so I'm probably the one most familiar with it.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

MAINTAINERS

@@ -384,6 +384,16 @@ F:	xen/include/asm-x86/
 F:	tools/firmware/hvmloader/
 F:	tools/tests/x86_emulator/
 
+X86 I/O EMULATION
+M:	Paul Durrant <paul.durrant@citrix.com>
+S:	Supported
+F:	xen/arch/x86/hvm/emulate.c
+F:	xen/arch/x86/hvm/intercept.c
+F:	xen/arch/x86/hvm/io.c
+F:	xen/include/asm-x86/hvm/emulate.h
+F:	xen/include/asm-x86/hvm/io.h
+F:	xen/include/public/hvm/ioreq.h
+
 X86 MEMORY MANAGEMENT
 M:	George Dunlap <george.dunlap@eu.citrix.com>
 S:	Supported
@@ -404,6 +414,12 @@ M:	Tim Deegan <tim@xen.org>
 S:	Maintained
 F:	xen/arch/x86/mm/shadow/
 
+X86 VIRIDIAN ENLIGHTENMENTS
+M:	Paul Durrant <paul.durrant@citrix.com>
+S:	Supported
+F:	xen/arch/x86/hvm/viridian.c
+F:	xen/include/asm-x86/hvm/viridian.h
+
 XENTRACE
 M:	George Dunlap <george.dunlap@eu.citrix.com>
 S:	Supported