debug: Add option to log to Linux tracing

debug: Add option to log to Linux tracing

Add the option (-T) to wpa_supplicant to log all debug messages into the
kernel tracing, allowing to aggregate kernel debugging with
wpa_supplicant debugging and recording all with trace-cmd.

Since tracing has relatively low overhead and can be filtered
afterwards, record all messages regardless of log level. However, it
will honor the -K option and not record key material by default.

Signed-hostap: Johannes Berg <johannes.berg@intel.com>