android_rvh_replace_next_task_fair hook allows vendor modules to
override the next task selected by CFS. However the current code is
not calling set_next_entity() on the hierarchy of the replaced task
in the case where the previous task is CFS. Fix this issue.
Bug: 184720311
Change-Id: If6c35b1ddefd0829cd236dd821e5ac8aef7347c6
Signed-off-by: Pavankumar Kondeti <quic_pkondeti@quicinc.com>