sih: remove SYS_SIH parameter and extend SYS_HITL

ROMFS/px4fmu_common/init.d/airframes/1100_rc_quad_x_sih.hil

@@ -13,9 +13,5 @@ sh /etc/init.d/rc.mc_defaults
 set MIXER quad_x
 set PWM_OUT 1234
 
-# set HIL to avoid sensors startup
-param set SYS_HITL 1
-
-param set SYS_SIH 1
-
-param set BAT_N_CELLS 4
+# set SYS_HITL to 2 to start the SIH and avoid sensors startup
+param set SYS_HITL 2

ROMFS/px4fmu_common/init.d/rc.interface

@@ -202,7 +202,7 @@ then
 		if fmu mode_${AUX_MODE} $FMU_ARGS
 		then
 			# Append aux mixer to main device.
-			if param compare SYS_HITL 1
+			if param greater SYS_HITL 0
 			then
 				if mixer append ${OUTPUT_DEV} ${MIXER_AUX_FILE}
 				then

ROMFS/px4fmu_common/init.d/rcS

@@ -328,17 +328,16 @@ else
 	# Sensors System (start before Commander so Preflight checks are properly run).
 	# Commander needs to be this early for in-air-restarts.
 	#
-	if param compare SYS_HITL 1
+	if param greater SYS_HITL 0
 	then
 		set OUTPUT_MODE hil
 		sensors start -h
 		commander start --hil
-
 		# disable GPS
 		param set GPS_1_CONFIG 0
 
-		# start the SIH if needed
-		if  param compare SYS_SIH 1
+		# start the simulator in hardware if needed
+		if  param compare SYS_HITL 2
 		then
 			sih start
 		fi