Revert "FROMLIST: sched: Consolidate cpufreq updates"

This partially reverts commit b329d028.
The cfs_rq->decayed addition is kept to preserve the KMI until the next
KMI update.

Reason for revert: This change causes major perf issues.

Bug: 346750314
Bug: 343389622
Signed-off-by: William McVicker <willmcvicker@google.com>
[cmllamas: kept cfs_rq->decayed addition to preserve the KMI]
Signed-off-by: Carlos Llamas <cmllamas@google.com>
(cherry picked from https://android-review.googlesource.com/q/commit:eab28aad5261542a27b79a7f91ae442a49bdbbf6)
Merged-In: I496da55f509a3c1a7ba8f869c8db43d9509fc547
Change-Id: I496da55f509a3c1a7ba8f869c8db43d9509fc547