xdp: Remove unused events xdp_redirect_map and xdp_redirect_map_err

xdp: Remove unused events xdp_redirect_map and xdp_redirect_map_err

Each TRACE_EVENT() defined can take up around 5K of text and meta data
regardless if they are used or not. New code is being developed that will
warn when a tracepoint is defined but not used.

The trace events xdp_redirect_map and xdp_redirect_map_err are defined but
not used, but there's also a comment that states these are kept around for
backward compatibility. Which is interesting because since they are not
used, any old BPF program that expects them to exist will get incorrect
data (no data) when they use them. It's worse than not working, it's
silently failing.

Remove them as they will soon cause warnings, or if they really need to
stick around, then code needs to be added to use them.

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Reviewed-by: Toke Høiland-Jørgensen <toke@kernel.org>
Acked-by: Jesper Dangaard Brouer <hawk@kernel.org>
Link: https://lore.kernel.org/r/20250611155615.0c2cf61c@batman.local.home
Signed-off-by: Alexei Starovoitov <ast@kernel.org>