MAINTAINERS - add keyboard driver to Hyper-V file list

Signed-off-by: NHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

MAINTAINERS

@@ -4008,6 +4008,7 @@ F:	arch/x86/include/uapi/asm/hyperv.h
 F:	arch/x86/kernel/cpu/mshyperv.c
 F:	drivers/hid/hid-hyperv.c
 F:	drivers/hv/
+F:	drivers/input/serio/hyperv-keyboard.c
 F:	drivers/net/hyperv/
 F:	drivers/scsi/storvsc_drv.c
 F:	drivers/video/hyperv_fb.c