Bump configs/qemu_* to latest longterm kernel 5.4.42.
All defconfig using a specific kernel version (csky, risc32) are not
taken into account.
Build and runtime tested: https://gitlab.com/jugurthaB/buildroot/-/pipelines/177882458
Signed-off-by: Jugurtha BELKALEM <jugurtha.belkalem@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
