AP_SerialManager: added a new MSP DisplayPort serial backend

libraries/AP_SerialManager/AP_SerialManager.cpp

@@ -524,6 +524,7 @@ void AP_SerialManager::init()
 #if HAL_MSP_ENABLED                    
                 case SerialProtocol_MSP:
                 case SerialProtocol_DJI_FPV:
+                case SerialProtocol_MSP_DisplayPort:
                     // baudrate defaults to 115200
                     state[i].baud.set_default(AP_SERIALMANAGER_MSP_BAUD/1000);
                     uart->begin(map_baudrate(state[i].baud),

libraries/AP_SerialManager/AP_SerialManager.h

@@ -155,6 +155,7 @@ public:
         SerialProtocol_Torqeedo = 39,
         SerialProtocol_AIS = 40,
         SerialProtocol_CoDevESC = 41,
+        SerialProtocol_MSP_DisplayPort = 42,
         SerialProtocol_NumProtocols                    // must be the last value
     };
 
@@ -162,7 +163,7 @@ public:
     static AP_SerialManager *get_singleton(void) {
         return _singleton;
     }
-    
+
     // init_console - initialise console at default baud rate
     void init_console();
 
@@ -181,7 +182,7 @@ public:
 
     // find_portnum - find port number (SERIALn index) for a protocol and instance, -1 for not found
     int8_t find_portnum(enum SerialProtocol protocol, uint8_t instance) const;
-    
+
     // get_mavlink_channel - provides the mavlink channel associated with a given protocol (and instance)
     //  instance should be zero if searching for the first instance, 1 for the second, etc
     //  returns true if a channel is found, false if not
@@ -193,7 +194,7 @@ public:
     // get_mavlink_protocol - provides the specific MAVLink protocol for a
     // given channel, or SerialProtocol_None if not found
     SerialProtocol get_mavlink_protocol(mavlink_channel_t mav_chan) const;
-    
+
     // set_blocking_writes_all - sets block_writes on or off for all serial channels
     void set_blocking_writes_all(bool blocking);
 
@@ -217,7 +218,7 @@ public:
 
 private:
     static AP_SerialManager *_singleton;
-    
+
     // array of uart info
     struct UARTState {
         AP_Int8 protocol;