AP_Arming: remove ahrs check from ins

libraries/AP_Arming/AP_Arming.cpp

@@ -207,12 +207,6 @@ bool AP_Arming::ins_checks(bool report)
             }
         }
 #endif
-        if (!ahrs.healthy()) {
-            if (report) {
-                GCS_MAVLINK::send_statustext_all(MAV_SEVERITY_CRITICAL, PSTR("PreArm: AHRS not healthy"));
-            }
-            return false;
-        }
     }
 
     return true;