sched: Fix incorrect usage of SCHED_CPUFREQ_INTERCLUSTER_MIG flag

Mark the source/destination CPUs correctly for inter cluster
migration.

Change-Id: I771b9357d20cb0270465abd594fb94bb3669c936
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Puja Gupta <pujag@codeaurora.org>