thinknode_m6: don't drive GPS REINIT pin so the L76K is detected

variants/thinknode_m6/variant.cpp

@@ -30,6 +30,8 @@ void initVariant() {
   digitalWrite(PIN_GPS_STANDBY, HIGH);
   pinMode(PIN_GPS_EN, OUTPUT);
   digitalWrite(PIN_GPS_EN, HIGH);
-  pinMode(PIN_GPS_RESET, OUTPUT);
-  digitalWrite(PIN_GPS_RESET, HIGH);
+  // PIN_GPS_RESET (pin 29 / REINIT) is intentionally left floating (input).
+  // Driving it HIGH holds the L76K silent, so it never streams NMEA and the
+  // firmware reports "no GPS". Letting it float lets the module run, matching
+  // the Meshtastic M6 variant. See GPS_RESET (-1) in variant.h.
 }

variants/thinknode_m6/variant.h

@@ -102,7 +102,12 @@
 #define PIN_GPS_RX              (2)
 #define PIN_GPS_TX              (3)
 #define PIN_GPS_EN              (6)    // EN
-#define PIN_GPS_RESET           (29)
+#define PIN_GPS_RESET           (29)   // REINIT - must FLOAT; driving it (esp. HIGH) silences the L76K
+// The M6's L76K streams NMEA on its own and must not have its REINIT pin driven.
+// Tell the location provider there is no reset pin so it never touches pin 29
+// (driving it HIGH holds the module silent). Matches Meshtastic, which leaves
+// this pin as an input. See variant.cpp (pin 29 is intentionally not configured).
+#define GPS_RESET               (-1)
 #define PIN_GPS_STANDBY         (30)   // STANDBY
 #define PIN_GPS_PPS             (31)
 #define GPS_BAUD_RATE           9600