enable gyro_calibration for CAN nodes

- allow saving initial gyro cal if very close to 0

ROMFS/cannode/init.d/rcS

@@ -86,10 +86,17 @@ unset BOARD_RC_SENSORS
 . ${R}etc/init.d/rc.serial
 
 # Check for flow sensor
-if param compare SENS_EN_PX4FLOW 1
+if param compare -s SENS_EN_PX4FLOW 1
 then
 	px4flow start -X &
 fi
 
+if param compare -s IMU_GYRO_CAL_EN 1
+then
+	gyro_calibration start
+fi
+
+sensors start
+
 uavcannode start
 unset R