sched: set LBF_IGNORE_PREFERRED_CLUSTER_TASKS correctly

The LBF_IGNORE_PREFERRED_CLUSTER_TASKS flag needs to be set
for all types of inter-cluster load balance. Currently this
is set only when higher capacity CPU is pulling the tasks from
a lower capacity CPU. This can result in the migration of grouped
tasks from higher capacity cluster to lower capacity cluster.

Change-Id: Ib0476c5c85781804798ef49268e1b193859ff5ef
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>