feat(tdeck): enable GPS support and configure pins

variants/lilygo_tdeck/target.cpp

@@ -14,7 +14,8 @@ WRAPPER_CLASS radio_driver(radio, board);
 
 ESP32RTCClock fallback_clock;
 AutoDiscoverRTCClock rtc_clock(fallback_clock);
-SensorManager sensors;
+MicroNMEALocationProvider gps(Serial1, &rtc_clock);
+EnvironmentSensorManager sensors(gps);
 
 #ifdef DISPLAY_CLASS
   DISPLAY_CLASS display;
@@ -24,6 +25,7 @@ SensorManager sensors;
 bool radio_init() {
   fallback_clock.begin();
   rtc_clock.begin(Wire);
+  Wire.begin(18, 8);
 
 #if defined(P_LORA_SCLK)
   return radio.std_init(&spi);