MAINTAINERS: iio: move Peter Meerwald-Stadler to CREDITS

Haven't had much time lately and moved on to different things.
Thanks Jonathan for the gentle introduction to Linux land.
Signed-off-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Reviewed-by: Matt Ranostay <matt.ranostay@konsulko.com>
Link: https://lore.kernel.org/r/20210125195654.580465-1-pmeerw@pmeerw.netSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

CREDITS

@@ -2536,6 +2536,14 @@ D: Linux/PARISC hacker
 D: AD1889 sound driver
 S: Ottawa, Canada
 
+N: Peter Meerwald-Stadler
+E: pmeerw@pmeerw.net
+W: https://pmeerw.net
+D: IIO reviewing, drivers
+S: Schießstandstr. 3a
+S: A-5061 Elsbethen
+S: Austria
+
 N: Dirk Melchers
 E: dirk@merlin.nbg.sub.org
 D: 8 bit XT hard disk driver for OMTI5520

MAINTAINERS

@@ -8694,7 +8694,6 @@ F:	drivers/iio/multiplexer/iio-mux.c
 IIO SUBSYSTEM AND DRIVERS
 M:	Jonathan Cameron <jic23@kernel.org>
 R:	Lars-Peter Clausen <lars@metafoo.de>
-R:	Peter Meerwald-Stadler <pmeerw@pmeerw.net>
 L:	linux-iio@vger.kernel.org
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git