MAINTAINERS: add maintainer for ADMV8818 driver

Add myself as maintainer for the ADMV8818 driver.
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://lore.kernel.org/r/20220117070039.6139-3-antoniu.miclaus@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

MAINTAINERS

@@ -1154,6 +1154,14 @@ W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/frequency/adi,admv1013.yaml
 F:	drivers/iio/frequency/admv1013.c
 
+ANALOG DEVICES INC ADMV8818 DRIVER
+M:	Antoniu Miclaus <antoniu.miclaus@analog.com>
+L:	linux-iio@vger.kernel.org
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml
+F:	drivers/iio/filter/admv8818.c
+
 ANALOG DEVICES INC ADP5061 DRIVER
 M:	Michael Hennerich <Michael.Hennerich@analog.com>
 L:	linux-pm@vger.kernel.org