Revert "mm: align larger anonymous mappings on THP boundaries"

This reverts commit efa7df3e.

It causes testing failures due to a lack of entropy in the system, so
revert it for now.  This has been reported to upstream, hopefully it
gets resolved soon there.

Bug: 254683164
Link: https://lore.kernel.org/all/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD-sQ@mail.gmail.com/


Cc: Suren Baghdasaryan <surenb@google.com>
Change-Id: I36bb4981fe7782a63ab90406dead59fea6d2ae42
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>