linux-yocto: gather reproducibility configs into a fragment

linux-yocto: gather reproducibility configs into a fragment

Updating the meta SRCREV to pickup the following fix:

    commit 9e68afb48b16a447dcd3996ffa350f3e79e44257 (HEAD -> master)
    Author: Bruce Ashfield <bruce.ashfield@gmail.com>
    Date:   Thu May 28 11:22:22 2020 -0400

        features: add reproducibility fragement

        Creating an initial feature fragment that can be included when a
        reproducible kernel build is desired. This is currently only one
        option, but will have more in the future.

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