add distroconfig.txt for gpi case 2w to GpiCase.arm and Pi02GPi.arm builds about lakka-libreelec

[jdalmanza]

an alternative to adding this text file to the two existing device builds would be to create two new deices and name them accordingly (RPiZeroGPiCase2w and RPiZero2GPiCase2w ... see Issue#1910 for recommendation on updated naming for the previous images) but unless the goal is to look like we support more devices, I think we can serve the users just as well by including an additional distroconfig file to these device builds to be more efficient

-- actually, i have just recently seen how we treat composite out for the other raspberry pi boards by including a distroconfig-composite.txt and commenting out the include statement in the config.txt, we could actually just do that for these devices and it would work just fine