linux-yocto/5.10: aufs fixes

It was reported that aufs was behaving incorrectly on arm/x86. Although
we don't have an exact fix for the issues, the Wind River guys were able
to come up with a minimal patch set to fix just the core issue, versus
a full aufs uprev.

We didn't have time to get this in before the release, but picking it up
in a dot release is sufficient. (given that it took several months for
the issue to be noticed).

Integrating the following commit(s) to linux-yocto/5.10:

    a8808e541750 aufs: linux-v5.10-rc1, no more f_op->read() and ->write()
    cb1c41dac775 for aufs: linux-v5.10-rc1, no more vfs_(read|write)f_t
    a5805df6583f aufs: linux-v5.10-rc1, no more set_fs()
    64e145dcca8c Revert "aufs: initial port to v5.10"

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