MAINTAINERS: remove adi,ad7606.yaml from SEPS525

Remove Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml from
STAGING - SEPS525 LCD CONTROLLER DRIVERS. This was likley a copy/paste
mistake. There is no bindings file for SEPS525 since it is only in
staging.

The removed file matches Documentation/devicetree/bindings/iio/*/adi,*
under ANALOG DEVICES INC IIO DRIVERS already so wasn't just misplaced.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250303-maintainers-remove-adi-ad7606-yaml-from-seps525-lcd-controller-v1-1-a4e4f1b824ab@baylibre.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>