thinknode_m6: don't drive GPS REINIT pin (fixes GPS never detected)

The M6's L76K GPS streams NMEA at 9600 baud on its own, but the firmware
reported no GPS. Root cause: pin 29 (PIN_GPS_RESET / the module's REINIT
line) was driven HIGH, which holds the L76K silent so it never emits any
sentences and detection fails.

variant.cpp drove pin 29 HIGH at boot, and because PIN_GPS_RESET was
defined, MicroNMEALocationProvider also drove it HIGH in begin(). Bench
testing on a sealed M6 (passive NMEA capture, no logic analyzer) confirmed:
pin 29 driven HIGH = 0 bytes; pin 29 floating = full NMEA stream.

Define GPS_RESET (-1) so the location provider never touches pin 29, and
stop driving it in initVariant. This matches the Meshtastic M6 variant,
which leaves the same pin as a floating input.

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