Revert "selftests/bpf: validate that tail call invalidates packet pointers"

This reverts commit b7c0d2d4 which is
commit d9706b56 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: Idc87be361a116e8167341bce65c022dfddea3dd3
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>