Fix Ikoka Stick builds

Author: mannkind

variants/ikoka_stick_nrf/platformio.ini

@@ -27,6 +27,7 @@ build_flags = ${nrf52_base.build_flags}
   -D PIN_USER_BTN=0
   -D PIN_WIRE_SCL=7
   -D PIN_WIRE_SDA=6
+  -UENV_INCLUDE_GPS
 lib_deps = ${nrf52_base.lib_deps}
   ${sensor_base.lib_deps}