Revert "PM/devfreq: governor: Add a private governor_data for governor"

This reverts commit cea018aa which is
commit 5fdded84 upstream.

It breaks the Android kernel api and is not needed for Android systems
as they do not support this type of functionality.

If it is needed to be brought back in the future, it can be done so in a
way that does not break the ABI.

Bug: 161946584
Fixes: cea018aa ("PM/devfreq: governor: Add a private governor_data for governor")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I0107d52a8f445548f7de462315dbe99ec4ab3d98