Give an option for stop parse beyond a given layer of overlay

[424778940z]

I'm using this module on an uboot its file, which is the same syntex as device tree dts
I understand this is not the intented usage for this module, but the purpose for this issue apply to both

I have a node like this, when I read it from file as txt, then parse by parse_dts, it will fail because kernel/arch/arm64/boot/dts/rk3568-evb1-ddr4-v10-linux.dtb is not exist yet.

    images {
        fdt {
            data = /incbin/("kernel/arch/arm64/boot/dts/rk3568-evb1-ddr4-v10-linux.dtb");
            type = "flat_dt";
            arch = "arm64";
            compression = "none";
            load = <0xffffff00>;

            hash {
                algo = "sha256";
            };
        };
    };

It may not seems useful when the required file is missing
But actually there is a need for, which is for patching the source before it get used

It would be nice if we could have an option to stop it from parsing further than a given layer number/count