Added the lopper dts file to generate imagebuilder config from system-device-tree

Lopper parses the device tree for a "xen" label. It parses the sub nodes
to determine the DOM0_VCPUS, DOM0_MEM, NUM_DOMUS, DOMU_VCPUS[],
DOMU_MEM[] and DOMU_PASSTHROUGH_PATHS[]

As an example, consider the following snippet of system-device-tree

xen: domain@2 {
    compatible = "openamp,domain-v1","openamp,hypervisor-v1";
    cpus = <&cpus_a72 0x3 0x00000002>;
    memory = <0x0 0x500000 0x0 0x7fb00000>;

    dom0: domain@3 {
        compatible = "openamp,domain-v1","xen,domain-v2";
        cpus = <&cpus_a72 0x3 0x00000001>;
        memory = <0x0 0x501000 0x0 0x3faff000>;
    };

    linux1: domain@4 {
        compatible = "openamp,domain-v1","xen,domain-v2";
        cpus = <&cpus_a72 0x3 0x00000001>;
        memory = <0x0 0x501000 0x0 0x3faff000>;
        access = <&mmc0 0x0>;
    };

    linux2: domain@5 {
        compatible = "openamp,domain-v1","xen,domain-v2";
        cpus = <&cpus_a72 0x3 0x00000001>;
        memory = <0x0 0x40000000 0x0 0x40000000>;

        firewallconfig = <&linux1 1 0>;
    };
};

python3 _path_to_/lopper.py  -f --enhanced -i path_to_/lop-xen.dts  device-trees/system-device-tree-xen.dts > config

The contents of the 'config' will be as follows :-

NUM_DOMUS=2
DOM0_VCPUS = 2
DOM0_MEM = 1018
DOMU_VCPUS[0] = 2
DOMU_MEM[0] = 1018
DOMU_PASSTHROUGH_PATHS[0] = "/bus@f1000000/sdhci@f1050000"
DOMU_VCPUS[1] = 2
DOMU_MEM[1] = 1024

This is provided as the input configuration file for the imagebuilder.

Signed-off-by: Bruce Ashfield <bruce.ashfield@xilinx.com>
Signed-off-by: Ayan Kumar Halder <ayankuma@xilinx.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
[stefano: minor style and grammar fixes]
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>

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