sensors: ASSISTED switch channel added

src/modules/uORB/topics/rc_channels.h

@@ -53,9 +53,12 @@
 /**
  * The number of RC channel inputs supported.
  * Current (Q1/2013) radios support up to 18 channels,
- * leaving at a sane value of 14.
+ * leaving at a sane value of 15.
+ * This number can be greater then number of RC channels,
+ * because single RC channel can be mapped to multiple
+ * functions, e.g. for various mode switches.
  */
-#define RC_CHANNELS_MAX   14
+#define RC_CHANNELS_MAX   15
 
 /** 
  * This defines the mapping of the RC functions.
@@ -70,14 +73,15 @@ enum RC_CHANNELS_FUNCTION
   YAW      = 3,
   MODE = 4,
   RETURN = 5,
-  MISSION = 6,
-  OFFBOARD_MODE = 7,
-  FLAPS   = 8,
-  AUX_1   = 9,
-  AUX_2   = 10,
-  AUX_3   = 11,
-  AUX_4   = 12,
-  AUX_5   = 13,
+  ASSISTED = 6,
+  MISSION = 7,
+  OFFBOARD_MODE = 8,
+  FLAPS   = 9,
+  AUX_1   = 10,
+  AUX_2   = 11,
+  AUX_3   = 12,
+  AUX_4   = 13,
+  AUX_5   = 14,
   RC_CHANNELS_FUNCTION_MAX /**< indicates the number of functions. There can be more functions than RC channels. */
 };