ANDROID: sched: Add restrict vendor hooks for load balance

The following restrict vendor hooks are added. The vendor hook
can selectively opt in for the default scheduler behavior by not
modifying the done argument.

- android_rvh_sched_newidle_balance: For newly idle load balance.

- android_rvh_sched_nohz_balancer_kick: For deciding if an idle
CPU is woken up to do nohz balance or not.

- android_rvh_find_busiest_queue: For selecting the busiest runqueue
among the CPUs in the busiest group selected in find_busiest_group.

- android_rvh_migrate_queued_task: Vendor implementations may require
both source and destination CPUs runqueue locks to be held while
calling set_task_cpu() during a task migration. Add a hook when
a queued task is migration so that vendor implementation can detach
the task and call set_task_cpu() with both runqueue locks held.

Bug: 173661641
Change-Id: I6a09226081061b6433e4231359be252a0f28f04b
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>