image_types: improve wks path specification
Hardcoding a full input path with zero flexibility goes against everything the
Yocto Project is about. Rework it to let the user specify the wks base
filename with WKS_FILE and it'll search the layers for the wks file and use
it.
Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
(From OE-Core master rev:
8cc7f5229f5447c2183ac319dd52c7ed737ec89b)
Signed-off-by: Joshua Lock <joshua.g.lock@intel.com>
