Add docker configs to enable docker support.

[Pratiksha0102]

No description provided.

[djkabutar]

Is this required, just making all required configs as module in kernel will suffice that, this is not required then.

[Pratiksha0102]

Docker doesn't work with configs as a module.

[djkabutar]

If we are always going to build the kernel with the docker fragmented config then there is no meaning of doing this way, rather giving all the configs in the rockchip_linux_defconfig makes more sense. The fragment is needed when sometime those configs needs to enabled for some device and for some device those are not required.

[Pratiksha0102]

Yes, this is for that purpose. We can disable this fragment if we don't want to include Docker in the kernel image. It's meant to keep the Docker configuration separate. In the future, when we release this build publicly, users will be able to identify the Docker-related configurations and disable them if they don't need Docker within kernel.

[djkabutar]

I don't think requiring a separate kernel build for the docker is necessary, it can be embedded into the rockchip_linux_defconfig only