UPSTREAM: selftests/bpf: extend changes_pkt_data with cases w/o subprograms

commit 04789af7 upstream.

Extend changes_pkt_data tests with test cases freplacing the main
program that does not have subprograms. Try four combinations when
both main program and replacement do and do not change packet data.

Change-Id: I24e74507af12d4a2b88f304c2b56ec8a859bda1b
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20241212070711.427443-2-eddyz87@gmail.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 473c5347)
Bug: 437846539
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>