Add an entry to fsl,imx8qm-irqsteer.

This fixes the following dt-schema warning:

failed to match any schema with compatible: ['fsl,imx8qm-irqsteer', 'fsl,imx-irqsteer']
Signed-off-by: Fabio Estevam <festevam@denx.de>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240701204106.160128-1-festevam@gmail.comSigned-off-by: Rob Herring (Arm) <robh@kernel.org>