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

This reverts commit 1062b761 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: I60920d1818dae3f17cd9b865dcf73493e1efa3df
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>