MAINTAINERS: update fsl,dpaa2-console.yaml reference

Changeset 616fde2d ("dt-bindings: misc: convert fsl,dpaa2-console from txt to YAML")
renamed: Documentation/devicetree/bindings/misc/fsl,dpaa2-console.txt
to: Documentation/devicetree/bindings/misc/fsl,dpaa2-console.yaml.

Update its cross-reference accordingly.

Fixes: 616fde2d ("dt-bindings: misc: convert fsl,dpaa2-console from txt to YAML")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>