MAINTAINERS: fix nonexistent dtbinding file name

The blamed commit converted the fsl,qoriq-mc.txt into fsl,qoriq-mc.yaml
but forgot to also update the MAINTAINERS file to reference the new
filename.

Fix this by using the corrent filename - fsl,qoriq-mc.yaml.

Fixes: bfb921b ("dt-bindings: misc: fsl,qoriq-mc: convert to yaml format")
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/20250320120319.3520315-3-ioana.ciornei@nxp.com
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>

MAINTAINERS

@@ -19298,7 +19298,7 @@ M:	Ioana Ciornei <ioana.ciornei@nxp.com>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 F:	Documentation/ABI/stable/sysfs-bus-fsl-mc
-F:	Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt
+F:	Documentation/devicetree/bindings/misc/fsl,qoriq-mc.yaml
 F:	Documentation/networking/device_drivers/ethernet/freescale/dpaa2/overview.rst
 F:	drivers/bus/fsl-mc/
 F:	include/uapi/linux/fsl_mc.h