kern-tools: fix custom repository BSP generation

Updating the SCRCREV to pick up the following fix

    updateme: use absolute path for generated BSP descriptions

    When a custom BSP is used, a top level BSP is generated by the tools and fed
    to the build system just as a user defined BSP would be located and
    passed. The location of the generated file is placed in the top_tgt file,
    which is used by subsequent stages. A relative path was being placed into
    top_tgt, which binds the build to a particular directory structure and
    working directory.

    The location of parts of the build have changed, and this relative path is
    no longer accurate. Changing it to an absolute path solve the build issues
    related to custom BSPs.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>