bmm150:Restored lost internal i2C

boards/px4/fmu-v4/init/rc.board_sensors

@@ -19,7 +19,7 @@ ist8310 start
 bmp280 -I start
 
 # expansion i2c used for BMM150 rotated by 90deg
-bmm150 -R 2 start
+bmm150 -X -R 2 start
 
 # For Teal One airframe
 if param compare SYS_AUTOSTART 4250

src/drivers/magnetometer/bmm150/bmm150.cpp

@@ -86,8 +86,12 @@ void start(bool external_bus, enum Rotation rotation)
 #endif
 
 	} else {
+#if defined(PX4_I2C_BUS_ONBOARD)
+		*g_dev_ptr = new BMM150(PX4_I2C_BUS_ONBOARD, path, rotation);
+#else
 		PX4_ERR("Internal I2C not available");
 		exit(0);
+#endif
 	}
 
 	if (*g_dev_ptr == nullptr) {