I found the gitlab commit in the beta11 branch. I just needed to ad a few lines to the es_input.cfg in system/.emulationstation/ .
Now 7.1.1-reloaded works. This might help every other odroid go advance (v1) user. It has to be added before </inputList> at the end of the file.
<!-- Odroid Advance Go Internal controler -->
<inputConfig type="joystick" deviceName="odroidgo2_joypad" deviceGUID="19000000010000000100000001010000" deviceNbAxes="2" deviceNbHats="0" deviceNbButtons="16">
<input name="joystick1up" type="axis" id="1" value="-1" code="1" />
<input name="joystick1left" type="axis" id="0" value="-1" code="0" />
<input name="lum-" type="button" id="14" value="1" code="708" />
<input name="lum+" type="button" id="15" value="1" code="709" />
<input name="vol-" type="button" id="12" value="1" code="706" />
<input name="vol+" type="button" id="1" value="1" code="707" />
<input name="left" type="button" id="8" value="1" code="546" />
<input name="down" type="button" id="7" value="1" code="545" />
<input name="right" type="button" id="9" value="1" code="547" />
<input name="up" type="button" id="6" value="1" code="544" />
<input name="r1" type="button" id="5" value="1" code="311" />
<input name="l1" type="button" id="4" value="1" code="310" />
<input name="y" type="button" id="3" value="1" code="308" />
<input name="x" type="button" id="2" value="1" code="307" />
<input name="b" type="button" id="0" value="1" code="304" />
<input name="a" type="button" id="1" value="1" code="305" />
<input name="hotkey" type="button" id="10" value="1" code="704" />
<input name="select" type="button" id="10" value="1" code="704" />
<input name="start" type="button" id="11" value="1" code="705" />
</inputConfig>