User controllable serial port power.

Thx to @raphaelcoeffic for numerous tips with YAML.
Tested with TX16S mkII.

radio/src/datastructs.h

@@ -116,33 +116,33 @@ static inline void check_struct()
   CHKSIZE(TrainerData, 16);
 
 #if defined(PCBXLITES)
-  CHKSIZE(RadioData, 859);
+  CHKSIZE(RadioData, 861);
   CHKSIZE(ModelData, 6161);
 #elif defined(PCBXLITE)
-  CHKSIZE(RadioData, 857);
+  CHKSIZE(RadioData, 859);
   CHKSIZE(ModelData, 6161);
 #elif defined(RADIO_TPRO)
-  CHKSIZE(RadioData, 840);
+  CHKSIZE(RadioData, 842);
   CHKSIZE(ModelData, 6186);
 #elif defined(PCBX7)
-  CHKSIZE(RadioData, 863);
+  CHKSIZE(RadioData, 865);
   CHKSIZE(ModelData, 6161);
 #elif defined(PCBX9E)
-  CHKSIZE(RadioData, 953);
+  CHKSIZE(RadioData, 955);
   CHKSIZE(ModelData, 6613);
 #elif defined(PCBX9D) || defined(PCBX9DP)
-  CHKSIZE(RadioData, 895);
+  CHKSIZE(RadioData, 897);
   CHKSIZE(ModelData, 6605);
 #elif defined(PCBHORUS)
   #if defined(PCBX10)
-    CHKSIZE(RadioData, 919);
+    CHKSIZE(RadioData, 921);
     CHKSIZE(ModelData, 11025);
   #else
-    CHKSIZE(RadioData, 901);
+    CHKSIZE(RadioData, 903);
     CHKSIZE(ModelData, 11023);
   #endif
 #elif defined(PCBNV14)
-  CHKSIZE(RadioData, 849);
+  CHKSIZE(RadioData, 851);
   CHKSIZE(ModelData, 10839);
 #endif