Update mqttd hal code, can control relay now

Guo Wenxue

2019-06-27 b64d6ff04401ed85fce543b8e20c8c360fb284f5

 mqttd/hal/led.h

@@ -7,10 +7,10 @@
 *
 *     pi@raspberrypi:~ $ gpio readall show BCM and wPi pinmap  
 *
 *                 LED      BCM           wPi 
 *                  G ---- GPIO.13  ---- GPIO.23
 *                  R ---- GPIO.19  ---- GPIO.24    
 *                  B ---- GPIO.26  ---- GPIO.25
 *                 LED      BCM           wPi           #PIN
 *                  G ---- GPIO.13  ---- GPIO.23  ----   33
 *                  R ---- GPIO.19  ---- GPIO.24  ----   35  
 *                  B ---- GPIO.26  ---- GPIO.25  ----   37
 *                  I ---- GND      ----
 *                 
 *        Version:  1.0.0(2018/10/14)