Revert "xsk: Fix race condition in AF_XDP generic RX path"

This reverts commit 65d3c570 which is
commit a1356ac7 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: I15acb18ebd9dd5a0d2fb0bf4153c5ced269f978a
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>