Revert "perf/aux: Fix AUX buffer serialization"

This reverts commit c4b69bee which is
commit 2ab9d830 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 (hint, it will be...)

Bug: 161946584
Change-Id: Ib2b142635750c4b2f88432b7cccb4ed971b1c70d
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>