MAINTAINERS: adjust file entry in INTEL STRATIX10 FIRMWARE DRIVERS

MAINTAINERS: adjust file entry in INTEL STRATIX10 FIRMWARE DRIVERS

Commit fbfb64987062 ("dt-bindings: firmware: stratix10: Convert to
json-schema") renames intel,stratix10-svc.txt to intel,stratix10-svc.yaml
in Documentation/devicetree/bindings/firmware/ as part of this dt-binding
conversion, but misses to adjust the file entry in INTEL STRATIX10 FIRMWARE
DRIVERS.

Adjust the file entry after the conversion.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Link: https://lore.kernel.org/r/20250512134332.36366-1-lukas.bulwahn@redhat.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>