tracing: Add SPDX License format to bpf_trace.c

Add the SPDX License header to ease license compliance management.

Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>