dt-bindings: interrupt-controller: Add fsl,icoll.yaml

Add fsl,icoll.yaml for i.MX23 and i.MX28.

Also add a generic fallback compatible string "fsl,icoll" for legacy
devices, which have existed for over 15 years.

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250724164624.1271661-1-Frank.Li@nxp.com


Signed-off-by: Rob Herring (Arm) <robh@kernel.org>