detect px4io conflicts, don't set sbus as default

src/drivers/rc/crsf_rc/CrsfRc.cpp

@@ -97,6 +97,11 @@ int CrsfRc::task_spawn(int argc, char *argv[])
 		return PX4_ERROR;
 	}
 
+	if (board_rc_conflicting(device_name)) {
+		PX4_INFO("unable to start, conflict with PX4IO on %s", device_name);
+		return PX4_ERROR;
+	}
+
 	CrsfRc *instance = new CrsfRc(device_name);
 
 	if (instance == nullptr) {

src/drivers/rc/dsm_rc/DsmRc.cpp

@@ -93,6 +93,11 @@ int DsmRc::task_spawn(int argc, char *argv[])
 		return -1;
 	}
 
+	if (board_rc_conflicting(device_name)) {
+		PX4_INFO("unable to start, conflict with PX4IO on %s", device_name);
+		return PX4_ERROR;
+	}
+
 	if (device_name && (access(device_name, R_OK | W_OK) == 0)) {
 		DsmRc *instance = new DsmRc(device_name);
 

src/drivers/rc/ghst_rc/GhstRc.cpp

@@ -88,6 +88,11 @@ int GhstRc::task_spawn(int argc, char *argv[])
 		return -1;
 	}
 
+	if (board_rc_conflicting(device_name)) {
+		PX4_INFO("unable to start, conflict with PX4IO on %s", device_name);
+		return PX4_ERROR;
+	}
+
 	if (device_name && (access(device_name, R_OK | W_OK) == 0)) {
 		GhstRc *instance = new GhstRc(device_name);
 

src/drivers/rc/sbus_rc/SbusRc.cpp

@@ -85,6 +85,11 @@ int SbusRc::task_spawn(int argc, char *argv[])
 		return -1;
 	}
 
+	if (board_rc_conflicting(device_name)) {
+		PX4_INFO("unable to start, conflict with PX4IO on %s", device_name);
+		return PX4_ERROR;
+	}
+
 	if (device_name && (access(device_name, R_OK | W_OK) == 0)) {
 		SbusRc *instance = new SbusRc(device_name);
 

src/drivers/rc/sbus_rc/module.yaml

@@ -4,7 +4,7 @@ serial_config:
       port_config_param:
         name: RC_SBUS_PRT_CFG
         group: Serial
-        default: RC
+        #default: RC
         #depends_on_port: RC
         description_extended: |
             SBUS RC driver.