Set pin for RAK-12039 to allow I2C auto-detect (#2555)

* SET pin for RAK-12039 and put back macaddr for now

* Guard against epaper RAK variant

* Update main.cpp

* Add these back

src/platform/nrf52/main-nrf52.cpp

@@ -172,6 +172,10 @@ void cpuDeepSleep(uint32_t msecToWake)
     setBluetoothEnable(false);
 #ifdef RAK4630
     digitalWrite(PIN_3V3_EN, LOW);
+#ifndef USE_EINK
+    // RAK-12039 set pin for Air quality sensor
+    digitalWrite(AQ_SET_PIN, LOW);
+#endif
 #endif
     // FIXME, use system off mode with ram retention for key state?
     // FIXME, use non-init RAM per
@@ -197,4 +201,4 @@ void clearBonds()
         nrf52Bluetooth->setup();
     }
     nrf52Bluetooth->clearBonds();
-}
+}