At the moment, static_prio_timeslice() is only used in 
sys_sched_rr_get_interval() and only gives the correct result for 
SCHED_FIFO and SCHED_RR tasks as the time slice for normal tasks is 
unrelated to the values returned by static_prio_timeslice().

This patch addresses this problem and in the process moves all the code 
associated with static_prio_timeslice() to sched_rt.c which is the only 
place where it now has relevance.

Signed-off-by: Peter Williams <pwil3058@bigpond.net.au>

Peter
-- 
Peter Williams                                   pwil3058@bigpond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
      -- Ambrose Bierce