thinknode_m5: gps support

variants/thinknode_m5/variant.h

@@ -19,4 +19,10 @@
 #define PIN_DISPLAY_RST                (41)
 #define PIN_DISPLAY_BUSY               (42)
 #define EXP_PIN_BACKLIGHT              (5)
-#define EXP_PIN_POWER                  (4)
+#define EXP_PIN_POWER                  (4)
+
+#define PIN_GPS_EN                      (11)
+#define PIN_GPS_RESET                   (13)
+#define PIN_GPS_RX                      (20)
+#define PIN_GPS_TX                      (19)
+#define PIN_GPS_SWITCH                  (10)