MAINTAINERS: update arm,vic.yaml reference

Changeset b7705ba6 ("dt-bindings: interrupt-controller: Convert ARM VIC to json-schema")
renamed: Documentation/devicetree/bindings/interrupt-controller/arm,vic.txt
to: Documentation/devicetree/bindings/interrupt-controller/arm,vic.yaml.

Update its cross-reference accordingly.

Fixes: b7705ba6 ("dt-bindings: interrupt-controller: Convert ARM VIC to json-schema")
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/ec54d0aa65a3b98ae425721663f196b499a59513.1634630485.git.mchehab+huawei@kernel.org