hyper-v: Add myself as additional MAINTAINER

Update the Hyper-V MAINTAINERS to include myself.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -5961,6 +5961,7 @@ F:	drivers/media/platform/sti/hva
 Hyper-V CORE AND DRIVERS
 M:	"K. Y. Srinivasan" <kys@microsoft.com>
 M:	Haiyang Zhang <haiyangz@microsoft.com>
+M:	Stephen Hemminger <sthemmin@microsoft.com>
 L:	devel@linuxdriverproject.org
 S:	Maintained
 F:	arch/x86/include/asm/mshyperv.h