Revert "kyber: fix out of bounds access when preempted"

This reverts commit 54dbe2d2 as it
breaks the kernel abi at the moment.  It will be restored at a later
point in time.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ida737ad962db2dc0ece0bd35ccb71e0db8e76fa2