dt-bindings: misc: aspeed,ast2400-cvic: Convert to DT schema

dt-bindings: misc: aspeed,ast2400-cvic: Convert to DT schema

Address warnings such as:

    arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-galaxy100.dtb: interrupt-controller@1e6c0080: 'valid-sources' does not match any of the regexes: 'pinctrl-[0-9]+'

and

    arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-galaxy100.dtb: /ahb/copro-interrupt-controller@1e6c2000: failed to match any schema with compatible: ['aspeed,ast2400-cvic', 'aspeed-cvic']

Note that the conversion to DT schema causes some further warnings to
be emitted, because the Aspeed devicetrees are not in great shape. These
new warnings are resolved in a separate series:

https://lore.kernel.org/lkml/20240802-dt-warnings-bmc-dts-cleanups-v1-0-1cb1378e5fcd@codeconstruct.com.au/

Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240808-dt-warnings-irq-aspeed-dt-schema-v2-2-c2531e02633d@codeconstruct.com.au
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>