MAINTAINERS: Add myself as the maintainer for Hyper-V VMBus

This way there is some contact point for incoming patches,
and somebody to review and pick up them.

Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>

MAINTAINERS

@@ -1777,6 +1777,12 @@ F: include/hw/block/fdc.h
 F: tests/qtest/fdc-test.c
 T: git https://gitlab.com/jsnow/qemu.git ide
 
+Hyper-V VMBus
+M: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
+S: Odd Fixes
+F: hw/hyperv/vmbus.c
+F: include/hw/hyperv/vmbus*.h
+
 OMAP
 M: Peter Maydell <peter.maydell@linaro.org>
 L: qemu-arm@nongnu.org