dt-bindings: iio: adc: AD9467: update maintainers

Update bindings maintainerns section.
Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
Acked-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Link: https://lore.kernel.org/r/20220526134603.75216-3-alexandru.tachici@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/adc/adi,ad9467.yaml

@@ -8,7 +8,6 @@ title: Analog Devices AD9467 and similar High-Speed ADCs
 
 maintainers:
   - Michael Hennerich <michael.hennerich@analog.com>
-  - Alexandru Ardelean <alexandru.ardelean@analog.com>
 
 description: |
   The AD9467 and the parts similar with it, are high-speed analog-to-digital