SITL: add SIM_ESC_TELEM

libraries/SITL/SITL.cpp

@@ -265,6 +265,8 @@ const AP_Param::GroupInfo SITL::var_info3[] = {
     // @Units: m
     // @User: Advanced
 
+    AP_GROUPINFO("ESC_TELEM", 40, SITL, esc_telem, 1),
+
     // user settable parameters for the 1st airspeed sensor
     AP_GROUPINFO("ARSPD_RND",     50, SITL,  arspd_noise[0], 2.0),
     AP_GROUPINFO("ARSPD_OFS",     51, SITL,  arspd_offset[0], 2013),

libraries/SITL/SITL.h

@@ -415,6 +415,9 @@ public:
     RichenPower richenpower_sim;
     IntelligentEnergy24 ie24_sim;
 
+    // ESC telemetry
+    AP_Int8 esc_telem;
+
     struct {
         // LED state, for serial LED emulation
         struct {