Revert "cpufreq: interactive: change and optimize load calculation"

This reverts commit 8f55e2d9c7de0789b214fbabfe708e41e7cb6ff7.
Revert "cpufreq: interactive/performance: expose cpu load"

This reverts commit 99d4ebba10c3ab3085f5716b11369b5666af7be9.