linux-yocto-rt/5.4: fix buld failure

linux-yocto-rt/5.4: fix buld failure

Integrating the following commit(s) to linux-yocto/5.4:

1/1 [
    Author: Bruce Ashfield
    Email: bruce.ashfield@gmail.com
    Subject: rt: drop -stable migrate_disable
    Date: Mon, 11 Dec 2023 08:50:52 -0500

    The -rt branches already have a migrate disable mechanism, we
    drop the -stable version to fix build issues.

    Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
]

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>