Set default baud rate to 9600.

gps_uart.h

@@ -6,7 +6,7 @@
 #define RX_BUF_SIZE 1024
 
 static const int gps_baudrates[5] = {9600, 19200, 38400, 57600, 115200};
-static int current_gps_baudrate = 3;
+static int current_gps_baudrate = 0;
 
 typedef struct {
     bool valid;