MAINTAINERS: Add missed file for Hyper-V

MAINTAINERS: Add missed file for Hyper-V

include/uapi/linux/hyperv.h is a part of Hyper-V support.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: devel@linuxdriverproject.org
Link: http://lkml.kernel.org/r/20170813133444.23386-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>