cpuidle: menu: Lookup CPU runqueues less

The menu governer makes separate lookups of the CPU runqueue to get
load and number of IO waiters but it can be done with a single lookup.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --cc drivers/cpuidle/governors/menu.c
Simple merge

diff --cc include/linux/sched.h
Simple merge

diff --cc kernel/sched/core.c
Simple merge

diff --cc kernel/sched/proc.c
Simple merge