sched: Remove some #ifdeffery

Remove a few gratuitous #ifdefs in pick_next_task*().

Cc: Ingo Molnar <mingo@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Juri Lelli <juri.lelli@gmail.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-nnzddp5c4fijyzzxxrwlxghf@git.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --cc kernel/sched/deadline.c
Simple merge

diff --cc kernel/sched/idle_task.c
Simple merge

diff --cc kernel/sched/rt.c
Simple merge

diff --cc kernel/sched/sched.h
Simple merge