Revert "ksm: check and skip page, if it is already scanned"

This reverts commit 668d78935ef9e4ba44994dfd8a115990799dfc25.
Revert "drivers/cpufreq/cpufreq.c: reduce log spam"

This reverts commit cb452eb703780f5ccb9fd20cb91e68b42ce8a4f6.