expose mavlink stream rates as parameters

ArduPlane/Parameters.h

@@ -53,8 +53,8 @@ public:
 
 		// 110: Telemetry control
 		//
-		k_param_streamrates_port0 = 110,
-		k_param_streamrates_port3,
+		k_param_gcs0 = 110, // stream rates for port0
+		k_param_gcs3,       // stream rates for port3
 		k_param_sysid_this_mav,
 		k_param_sysid_my_gcs,
         k_param_serial3_baud,

ArduPlane/Parameters.pde

@@ -121,7 +121,9 @@ static const AP_Param::Info var_info[] PROGMEM = {
 	GGROUP(pidNavPitchAltitude,     "ALT2PTCH_",  PID),
 
 	// variables not in the g class which contain EEPROM saved variables
-	GOBJECT(compass,                "COMPASS_",	Compass)
+	GOBJECT(compass,                "COMPASS_",	Compass),
+	GOBJECT(gcs0,					"SR0_",     GCS_MAVLINK),
+	GOBJECT(gcs3,					"SR3_",     GCS_MAVLINK)
 };