dt-bindings: iio: adc: axi-adc: 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/20220526134603.75216-4-alexandru.tachici@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/adc/adi,axi-adc.yaml

@@ -8,7 +8,6 @@ title: Analog Devices AXI ADC IP core
 
 maintainers:
   - Michael Hennerich <michael.hennerich@analog.com>
-  - Alexandru Ardelean <alexandru.ardelean@analog.com>
 
 description: |
   Analog Devices Generic AXI ADC IP core for interfacing an ADC device