During the work to enhance the ability to specify out of tree kernel
features, an assumption was made about PN being part of a patch
path. This assumption is incorrect, since patches can be anywhere in
the valid FILESPATH.
To make locating the patches in WORKDIR simple, we can just query
patch.bbclass and return both the absolute directory of the patch
and the subdirectory as it was specified on the src_uri.
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
