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The new hierachy of priority scales is as follows:

EVL_CORE_MIN_PRIO = EVL_WEAK_MIN_PRIO
...
	EVL_FIFO_MIN_PRIO ==
	     EVL_QUOTA_MIN_PRIO ==
	          EVL_TP_MIN_PRIO (== 1)
	...
	EVL_FIFO_MAX_PRIO =
	     EVL_QUOTA_MAX_PRIO ==
	          EVL_TP_MAX_PRIO ==
		       EVL_WEAK_MAX_PRIO (< MAX_USER_RT_PRIO)
...
EVL_CORE_MAX_PRIO (> MAX_RT_PRIO)

We reserve a couple of priority levels above the highest inband
kthread priority (MAX_RT_PRIO..MAX_RT_PRIO+1), which are guaranteed to
be higher than the highest inband user task priority
(MAX_USER_RT_PRIO-1) we use for SCHED_FIFO. Those extra levels can be
used for EVL kthreads which must top the priority of any userland
thread.

SCHED_EVL was dropped int the process, since userland is now
constrained to EVL_FIFO_MAX_PRIO by construction.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>