sched/numa: Pass destination cpu as a parameter to migrate_task_rq

This additional parameter (new_cpu) is used later for identifying if
task migration is across nodes.

No functional change.

Cc: Rik van Riel <riel@surriel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1533276841-16341-5-git-send-email-srikar@linux.vnet.ibm.com