Pass rtc_clock to all MicroNMEALocationProvider instances

Enable GPS time synchronization across all variants by passing
&rtc_clock to MicroNMEALocationProvider. When GPS gets a valid
fix, the RTC clock is now updated automatically every 30 minutes.

Updated 16 variants: rak4631, lilygo_tbeam_SX1262, rak_wismesh_tag,
lilygo_tbeam_supreme_SX1262, thinknode_m3, heltec_v4, thinknode_m1,
lilygo_tbeam_SX1276, meshadventurer, nano_g2_ultra, heltec_v3,
promicro, xiao_c3, heltec_tracker_v2, keepteen_lt1, heltec_mesh_solar.

variants/rak4631/target.cpp

@@ -26,7 +26,7 @@ AutoDiscoverRTCClock rtc_clock(fallback_clock);
 
 #if ENV_INCLUDE_GPS
   #include <helpers/sensors/MicroNMEALocationProvider.h>
-  MicroNMEALocationProvider nmea = MicroNMEALocationProvider(Serial1);
+  MicroNMEALocationProvider nmea = MicroNMEALocationProvider(Serial1, &rtc_clock);
   EnvironmentSensorManager sensors = EnvironmentSensorManager(nmea);
 #else
   EnvironmentSensorManager sensors;