The CONFIG_PPC_QUEUED_SPINLOCKS configuration option is not defined for
kernel 5.15, it is defined for kernel 5.10.
This fixes the compilation of mpc85xx/p2020 with kernel 5.15.
Reviewed-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>