bpf/selftests: coverage for tp and perf event progs using kfuncs

This coverage ensures that kfuncs are allowed within tracepoint and perf
event programs.

Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
Link: https://lore.kernel.org/r/20240905223812.141857-3-inwardvessel@gmail.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>