Revert "sched: remove WARN_ON(!sd) from init_sched_groups_power()"

This reverts commit ba19c6b7cf0407a9e347f0787ca4968d60775256.
Revert "sched: don't call get_group() for covered cpus"

This reverts commit f0e8a678e1c3e36be4ef0c5957c2cf4a3b78c169.
Revert "sched: Use cached value of span instead of calling sched_domain_span()"

This reverts commit 1e32666fb5a2355aabb4d0a8cd0713a52198ffe2.
Revert "sched: Micro-optimize the smart wake-affine logic"

This reverts commit e314039d63b89c73de10e406540717dceb8c8aeb.
Revert "sched: Implement smarter wake-affine logic"

This reverts commit 03a4d2b64d3705bd2de3c34082b784eb6545c243.