xunlong-orangepi3: new device

Finally found a patch to fix SD and eMMC. Needs more testing, but at a first glance everything works fine.

Wiki page

https://wiki.postmarketos.org/wiki/Xunlong_Orange_Pi_3_(xunlong-orangepi3)

MR dependencies

https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/22505

https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/22504