linux-yocto-rt/5.4: update to rt32

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

    2739bdb0bfa0 Linux 5.4.54-rt32
    0124e412ea96 Linux 5.4.52-rt31
    d85676a72421 Linux 5.4.49-rt30
    72bbd8083a44 Linux 5.4.48-rt29

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit b21783c1)
Signed-off-by: Steve Sakoman <steve@sakoman.com>