Rover: change baudrates to 16 bit

allows for much higher serial baud rates

APMrover2/Parameters.h

@@ -51,6 +51,9 @@ public:
         // misc2
         k_param_log_bitmask = 40,
         k_param_gps,
+        k_param_serial0_baud,
+        k_param_serial1_baud,
+        k_param_serial2_baud,
 
 
         // 110: Telemetry control
@@ -59,12 +62,12 @@ public:
         k_param_gcs1,       // stream rates for uartC
         k_param_sysid_this_mav,
         k_param_sysid_my_gcs,
-        k_param_serial0_baud,
-        k_param_serial1_baud,
+        k_param_serial0_baud_old,
+        k_param_serial1_baud_old,
         k_param_telem_delay,
         k_param_skip_gyro_cal,
         k_param_gcs2,       // stream rates for uartD
-        k_param_serial2_baud,
+        k_param_serial2_baud_old,
 
         //
         // 130: Sensor parameters
@@ -205,10 +208,10 @@ public:
 	//
 	AP_Int16    sysid_this_mav;
 	AP_Int16    sysid_my_gcs;
-    AP_Int8	    serial0_baud;
-    AP_Int8	    serial1_baud;
+    AP_Int16    serial0_baud;
+    AP_Int16    serial1_baud;
 #if MAVLINK_COMM_NUM_BUFFERS > 2
-    AP_Int8	    serial2_baud;
+    AP_Int16    serial2_baud;
 #endif
     AP_Int8     telem_delay;
     AP_Int8     skip_gyro_cal;