Set watchdog max_idle limits for flight

firmware/inc/watchdog.h

@@ -40,11 +40,12 @@ typedef enum {
 
 /**
  * Define how many iterations these loops are permitted before a reset
- * is triggered.
+ * is triggered. Values defined to be well above values encountered in
+ * normal operation.
  */
-#define MAXIDLE_WAIT_FOR_GPS		0x0000FFFF
-#define MAXIDLE_WHILE_TELEMETRY_ACTIVE	0x0000FFFF
-#define MAXIDLE_WAIT_FOR_NEXT_TELEMETRY	0x0000FFFF
+#define MAXIDLE_WAIT_FOR_GPS		1800
+#define MAXIDLE_WHILE_TELEMETRY_ACTIVE	60000
+#define MAXIDLE_WAIT_FOR_NEXT_TELEMETRY	7200
 
 struct idle_counter {
   uint32_t wait_for_gps;