Merge "legacy: Extern-ify as C LogMsg"

#include "bt_trace.h"

// Override LogMsg method so that we can output log via VLOG(1)

void LogMsg(uint32_t trace_set_mask, const char* fmt_str, ...) {

extern "C" void LogMsg(uint32_t trace_set_mask, const char* fmt_str, ...) {

  char buffer[256];

  va_list args;

  va_start(args, fmt_str);