dt-bindings: iio: adc: Add i.MX94 and i.MX95 support

Add compatible string "nxp,imx94-adc" and "nxp,imx95-adc", which is
backward compatible with i.MX93. Set it to fall back to "nxp,imx93-adc".

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20250306170825.239933-1-Frank.Li@nxp.com


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