x86/platform/uv: Update MAINTAINERS for uv_sysfs driver

Add an entry and email address for the new uv_sysfs driver and
its maintainer.

Signed-off-by: Justin Ernst <justin.ernst@hpe.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Steve Wahl <steve.wahl@hpe.com>
Link: https://lkml.kernel.org/r/20201125175444.279074-6-justin.ernst@hpe.com

MAINTAINERS

@@ -18354,6 +18354,12 @@ F:	include/uapi/linux/uuid.h
 F:	lib/test_uuid.c
 F:	lib/uuid.c
+UV SYSFS DRIVER
+M:	Justin Ernst <justin.ernst@hpe.com>
+L:	platform-driver-x86@vger.kernel.org
+S:	Maintained
+F:	drivers/platform/x86/uv_sysfs.c
+
 UVESAFB DRIVER
 M:	Michal Januszewski <spock@gentoo.org>
 L:	linux-fbdev@vger.kernel.org