MC: Handle PWM params in startup

ROMFS/px4fmu_common/init.d/rc.mc_defaults

@@ -11,6 +11,9 @@ then
 	param set PWM_MIN 1075
 	param set PWM_MAX 1950
 	param set PWM_RATE 400
+	param set PWM_AUX_DISARMED 1500
+	param set PWM_AUX_MIN 1000
+	param set PWM_AUX_MAX 2000
 
 	param set RTL_LAND_DELAY 0
 fi
@@ -20,14 +23,14 @@ set PWM_RATE p:PWM_RATE
 set PWM_DISARMED p:PWM_DISARMED
 set PWM_MIN p:PWM_MIN
 set PWM_MAX p:PWM_MAX
+set PWM_AUX_DISARMED p:PWM_AUX_DISARMED
+set PWM_AUX_MIN p:PWM_AUX_MIN
+set PWM_AUX_MAX p:PWM_AUX_MAX
 
 # This is the gimbal pass mixer
 set MIXER_AUX pass
 set PWM_AUX_RATE 50
 set PWM_AUX_OUT 1234
-set PWM_AUX_DISARMED 1500
-set PWM_AUX_MIN 1000
-set PWM_AUX_MAX 2000
 
 if param compare PWM_DISARMED 0
 then