Move MNT_MODE_IN / MOUNT_MODE_OUT logic block to rc.interface and move dataman, send_event, and load_mon startup just below uorb and tone_alarm startup in the rcS script.

ROMFS/px4fmu_common/init.d/rc.interface

@@ -23,6 +23,20 @@ then
 	set MIXER_AUX none
 fi
 
+#
+# If mount (gimbal) control is enabled and output mode is AUX, set the aux
+# mixer to mount (override the airframe-specific MIXER_AUX setting).
+#
+if param compare MNT_MODE_IN -1
+then
+else
+        if param compare MNT_MODE_OUT 0
+        then
+                set MIXER_AUX mount
+        fi
+fi
+
+
 if [ $MIXER != none -a $MIXER != skip ]
 then
 	#