Add an example BPF action program that prints the measured latency to
the tracefs buffer via bpf_printk().
A new Makefile target, "examples", is added to build the example. In
addition, "sample/" subfolder is renamed to "example".
If BPF skeleton support is unavailable or disabled, a warning will be
displayed when building the BPF action program example.
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Tomas Glozar <[email protected]>
