AP_Periph: choose node stats - build files

Added - AP_Stat library and AP_STATS_ENABLED build options

Tools/AP_Periph/wscript

@@ -62,6 +62,7 @@ def build(bld):
                      'AC_PID',
                      'AP_BLHeli',
                      'AP_ESC_Telem',
+                     'AP_Stats'
                      ]
     bld.ap_stlib(
         name= 'AP_Periph_libs',

libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py

@@ -2782,6 +2782,10 @@ def add_apperiph_defaults(f):
 #define AP_ROBOTISSERVO_ENABLED 0
 #endif
 
+#ifndef AP_STATS_ENABLED
+#define AP_STATS_ENABLED 0
+#endif
+
 /*
  * GPS Backends - we selectively turn backends on.
  *   Note also that f103-GPS explicitly disables some of these backends.