Revert "Revert "Revert "cpufreq: interactive/performance: expose cpu load"""

This reverts commit fdeecd7267d78de711e976716d7da0827d6ded04.
Revert "Revert "cpufreq: interactive/performance: expose cpu load""

This reverts commit ca6f0efc15d18f87cf81f619b9c1caa45a44cd54.
Revert "Revert "cpufreq: interactive: change and optimize load calculation""

This reverts commit 8ee3e5ce10068ab7a84c9bf66c3256ca23278b5e.