max7456 OSD module does not honor AC without a GNSS configurations

[OpenUAS]

When no GNSS device is available in airframe, e.g. optical nav, or pure FPV for indi control tests, there is now an error in the max7456.c latest changes, was not there before last pull.. OSD worked well.

... /Tinyhawk_II/ap/modules/display/max7456.o: in function home_direction': ... max7456.c:356: undefined reference to gps'

etc. etc. If time is found, a scarce thing ;) will fix self...

[OpenUAS]

As a temporary workaround ofcourse one can add even without a real GPS an module...

        <module name="gps" type="ublox"><!-- hes no GPS but it is a temp fixfor OSD module expecting GPS-->
          <configure name="GPS_BAUD" value="B460800"/>
          <configure name="GPS_PORT" value="UART2"/>
        </module>