RPI: fix startup scripts: start navigator & load parameters

posix-configs/rpi/px4.config

 uorb start
+param load
 param set SYS_AUTOSTART 4001
 param set MAV_BROADCAST 1
 sleep 1
@@ -10,6 +11,7 @@ df_ms5611_wrapper start
 gps start -d /dev/spidev0.0 -i spi -p ubx
 sensors start
 commander start
+navigator start
 attitude_estimator_q start
 position_estimator_inav start
 land_detector start multicopter

posix-configs/rpi/px4_fw.config

@@ -9,6 +9,7 @@ df_ms5611_wrapper start
 gps start -d /dev/spidev0.0 -i spi -p ubx
 sensors start
 commander start
+navigator start
 ekf2 start
 fw_att_control start
 fw_pos_control_l1 start