MAINTAINERS: add maintainer for ping iio sensors

Add a maintainer for the new parallax PING))) and LaserPING IIO sensors
Signed-off-by: Andreas Klinger <ak@it-klinger.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

MAINTAINERS

@@ -12293,6 +12293,13 @@ L:	platform-driver-x86@vger.kernel.org
 S:	Maintained
 F:	drivers/platform/x86/panasonic-laptop.c
 
+PARALLAX PING IIO SENSOR DRIVER
+M:	Andreas Klinger <ak@it-klinger.de>
+L:	linux-iio@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/iio/proximity/parallax-ping.yaml
+F:	drivers/iio/proximity/ping.c
+
 PARALLEL LCD/KEYPAD PANEL DRIVER
 M:	Willy Tarreau <willy@haproxy.com>
 M:	Ksenija Stanojevic <ksenija.stanojevic@gmail.com>