Revert "apcuclock-8974.c: overclocking changes"

This reverts commit d457fd1e3ea7396f80015707066c5eff0b0672f7.
Revert "acpuclock-9874.c: Added 2.72GHz & 2.80GHz"

This reverts commit cb46d1c2bd496dcb0c950ed70d444216712f6ee8.