Revert "cpufreq: fix using cpufreq-dt as module"

This reverts commit 5d8ba578 which is
commit f1f010c9 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I349824ff73ecfacb8b9705dc3d6781362712b6af
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>