MAINTAINERS: mark sunxi status as Orphan

Ian has not had any time for sunxi for some time now and I'm
in the same situation now, so I'm stepping down as sunxi
custodian and marking the sunxi support as Orphan.

Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

MAINTAINERS

@@ -167,9 +167,7 @@ F:	arch/arm/cpu/armv7/stv0991/
 F:	arch/arm/include/asm/arch-stv0991/
 
 ARM SUNXI
-M:	Ian Campbell <ijc@hellion.org.uk>
-M:	Hans De Goede <hdegoede@redhat.com>
-S:	Maintained
+S:	Orphan
 T:	git git://git.denx.de/u-boot-sunxi.git
 F:	arch/arm/cpu/armv7/sunxi/
 F:	arch/arm/include/asm/arch-sunxi/