MAINTAINERS: Add Wacom driver maintainers

As suggested by Bastien and Jiri.
Signed-off-by: Ping Cheng <ping.cheng@wacom.com>
Reviewed-by: Bastien Nocera <hadess@hadess.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

MAINTAINERS

@@ -8640,6 +8640,14 @@ F:	drivers/hid/hid-sensor-*
 F:	drivers/iio/*/hid-*
 F:	include/linux/hid-sensor-*
 
+HID WACOM DRIVER
+M:	Ping Cheng <ping.cheng@wacom.com>
+M:	Jason Gerecke  <jason.gerecke@wacom.com>
+L:	linux-input@vger.kernel.org
+S:	Maintained
+F:	drivers/hid/wacom.h
+F:	drivers/hid/wacom_*
+
 HIGH-RESOLUTION TIMERS, CLOCKEVENTS
 M:	Thomas Gleixner <tglx@linutronix.de>
 L:	linux-kernel@vger.kernel.org