Revert "wlan: prima: look for the binaries and configuration files in /sbin/wlan/. Due to mistmatching firmwares on this newer prima drivers my original solution was to injecting the files directly on /system but it never was a pretty clean solution at the end of the day. After some suggestions this looks to be the best to be non-intrusive to the user"

This reverts commit f6cb1056c5097758d588e492bf3d300d6a65439b.