linux-yocto/5.19: powerpc: Fix reschedule bug in KUAP-unlocked user copy

Integrating the following commit(s) to linux-yocto/5.19:

    84f2f8e7a625 powerpc: Fix reschedule bug in KUAP-unlocked user copy

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