MAINTAINERS: add ad3552r

Add an entry for the ad3552r DAC driver.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220404085000.249423-3-nuno.sa@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

MAINTAINERS

@@ -1090,6 +1090,14 @@ W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/adc/adi,ad7292.yaml
 F:	drivers/iio/adc/ad7292.c
 
+ANALOG DEVICES INC AD3552R DRIVER
+M:	Nuno Sá <nuno.sa@analog.com>
+L:	linux-iio@vger.kernel.org
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml
+F:	drivers/iio/dac/ad3552r.c
+
 ANALOG DEVICES INC AD7293 DRIVER
 M:	Antoniu Miclaus <antoniu.miclaus@analog.com>
 L:	linux-iio@vger.kernel.org