sched/deadline: Cleanup RT leftovers from {inc/dec}_dl_migration

In deadline class we do not have group scheduling.

So, let's remove unnecessary

	X = X;

equations.

Signed-off-by: Kirill Tkhai <ktkhai@parallels.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@gmail.com>
Link: http://lkml.kernel.org/r/1393343543.4089.5.camel@tkhai


Signed-off-by: Ingo Molnar <mingo@kernel.org>