Compiling the ltq-tapi driver against Linux 5.4 results in a compile
error complaining that the size of struct sched_param is not known.
Switch the existing "sched/types.h" include to reference
include/uapi/linux/sched/types.h to fix compilation against Linux 5.4.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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