dt-bindings:iio:adc: update the maintainer of vf610-adc

Drop Fugang Duan as the vf610-adc maintainer, and add my self as
the maintainer.
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1640073000-32629-2-git-send-email-haibo.chen@nxp.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/adc/fsl,vf610-adc.yaml

@@ -7,7 +7,7 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
 title: ADC found on Freescale vf610 and similar SoCs
 
 maintainers:
-  - Fugang Duan <fugang.duan@nxp.com>
+  - Haibo Chen <haibo.chen@nxp.com>
 
 description:
   ADCs found on vf610/i.MX6slx and upward SoCs from Freescale.