dt-bindings: imx: fsl,aips-bus: Ensure all properties are defined

Device specific schemas should not allow undefined properties which is
what 'additionalProperties: true' allows. Add a reference to
simple-bus.yaml which has the additional properties used, and fix this
constraint.

Signed-off-by: "Rob Herring (Arm)" <robh@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20250203213027.8284-1-robh@kernel.org