Support of HITL simulation for Intel Aero FC (#9132)

* Adding pwm_out_sim
* pwm_out_sim driver will be by default part of Aero FC PX4 Nuttx drivers
* tap_esc is off when SYS_HITL 1

ROMFS/px4fmu_common/init.d/4070_aerofc

@@ -68,10 +68,14 @@ then
 	param set SYS_LOGGER 1
 fi
 
-tap_esc start -d /dev/ttyS0 -n 4
-usleep 300000
+if param compare SYS_HITL 0
+then
+  tap_esc start -d /dev/ttyS0 -n 4
+  usleep 300000
+
+  set OUTPUT_MODE tap_esc
+fi
 
-set OUTPUT_MODE tap_esc
 set MIXER quad_x
 set USE_IO no