compass: fixed normal operation mode change for 5883L

We need to set the right rates after config too. Thanks to Randy for
spotting this one

git-svn-id: https://arducopter.googlecode.com/svn/trunk@2737 f9c3cf11-9bcb-44bc-f272-b75c42450872

libraries/AP_Compass/AP_Compass_HMC5843.cpp

@@ -120,7 +120,11 @@ AP_Compass_HMC5843::init()
 	  // leave test mode
 	  Wire.beginTransmission(COMPASS_ADDRESS);
 	  Wire.send(ConfigRegA);
+	  if (product_id == AP_COMPASS_TYPE_HMC5843) {
 		 Wire.send(NormalOperation);
+	  } else {
+		 Wire.send(SampleAveraging_8<<5 | DataOutputRate_75HZ<<2 | NormalOperation);
+	  }
 	  Wire.endTransmission();
 	  delay(50);