MAINTAINERS: update pmeerw's name

happily married for 4 month :)
Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

MAINTAINERS

@@ -5458,7 +5458,7 @@ IIO SUBSYSTEM AND DRIVERS
 M:	Jonathan Cameron <jic23@kernel.org>
 R:	Hartmut Knaack <knaack.h@gmx.de>
 R:	Lars-Peter Clausen <lars@metafoo.de>
-R:	Peter Meerwald <pmeerw@pmeerw.net>
+R:	Peter Meerwald-Stadler <pmeerw@pmeerw.net>
 L:	linux-iio@vger.kernel.org
 S:	Maintained
 F:	drivers/iio/