Rtl8822cu for OpenWrt

[slh]

OpenWrt on Orange pi R1

The situation around Realtek wireless drivers, particularly USB wireless drivers, is an utter mess. Realtek pushes out new, slightly changed, wireless chipsets 2-3 times a year, each with their own vendor driver[0], which is subsequently forgotten about immediately, in favour of the next one - but doesn't follow up with upstreaming them at all[1]. For a while these drivers were accepted into staging, but after six drivers ended up there[2], rotting away without ever getting closer to being mainl…