Refactor uboot-script-gen

Extract some of the functions from uboot-script-gen into common.
This will be sourced by disk_image(in subsequent patch) which will
invoke the functions for generating dtb.
common will have access to all the environment variables defined in
the Imagebuilder config file as described in README.md

Signed-off-by: Ayan Kumar Halder <ayankuma@xilinx.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>

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