Exercise 9 now acquires satellites, more to do for this exercise, e.g. logging and RTC time setting

exercises/09_GPS_Time/platformio.ini

@@ -23,6 +23,10 @@ build_flags =
   -D OLED_SDA=17
   -D OLED_SCL=18
   -D OLED_ADDR=0x3C
+  -D GPS_RX_PIN=9
+  -D GPS_TX_PIN=8
+  -D GPS_WAKEUP_PIN=7
+  -D GPS_1PPS_PIN=6
   -D ARDUINO_USB_MODE=1
   -D ARDUINO_USB_CDC_ON_BOOT=1