Remove heltec-specific gps code from main.cpp (#4508)

After the recent GPS power work we have an clear set of
definitions for turning GPS on and off. Rather than manipulating
specific heltec tracker-related pins in main setu, the relevant
power management code in the GPS module will turn things
on/off later as needed.

src/main.cpp

@@ -294,21 +294,11 @@ void setup()
     digitalWrite(VEXT_ENABLE, 0); // turn on the display power
 #endif
 
-#if defined(VGNSS_CTRL_V03)
-    pinMode(VGNSS_CTRL_V03, OUTPUT);
-    digitalWrite(VGNSS_CTRL_V03, LOW);
-#endif
-
 #if defined(VTFT_CTRL_V03)
     pinMode(VTFT_CTRL_V03, OUTPUT);
     digitalWrite(VTFT_CTRL_V03, LOW);
 #endif
 
-#if defined(VGNSS_CTRL)
-    pinMode(VGNSS_CTRL, OUTPUT);
-    digitalWrite(VGNSS_CTRL, LOW);
-#endif
-
 #if defined(VTFT_CTRL)
     pinMode(VTFT_CTRL, OUTPUT);
     digitalWrite(VTFT_CTRL, LOW);
@@ -1121,4 +1111,4 @@ void loop()
     }
     // if (didWake) LOG_DEBUG("wake!\n");
 }
-#endif
+#endif