MAINTAINERS: remove drivers/staging/hv/

This directory was removed by commit 89ae7d7 (hv: storvsc: Move the
storage driver out of the staging area).

Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -3596,7 +3596,6 @@ S:	Maintained
 F:	drivers/hv/
 F:	drivers/hid/hid-hyperv.c
 F:	drivers/net/hyperv/
-F:	drivers/staging/hv/
 
 I2C OVER PARALLEL PORT
 M:	Jean Delvare <khali@linux-fr.org>