target/openrisc: Add interrupted CPU to log

When we are tracing it's helpful to know which CPU's are getting
interrupted, add that detail to the log line.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Stafford Horne <shorne@gmail.com>

target/openrisc/interrupt.c

@@ -83,7 +83,9 @@ void openrisc_cpu_do_interrupt(CPUState *cs)
             [EXCP_TRAP]     = "TRAP",
         };
 
-        qemu_log_mask(CPU_LOG_INT, "INT: %s\n", int_name[exception]);
+        qemu_log_mask(CPU_LOG_INT, "CPU: %d INT: %s\n",
+                      cs->cpu_index,
+                      int_name[exception]);
 
         hwaddr vect_pc = exception << 8;
         if (env->cpucfgr & CPUCFGR_EVBARP) {