The PR has been merged 
So with the next round of built snapshots you can just download an image which then already has the DSL drivers included.
One simply has to take care of the firmware files, as per https://github.com/openwrt/openwrt/commit/539b52068a079801fe0955f7cf5f39e536a08803
My vr11 branch is gone with that, and the vr11fw one is now rebased on master.
Nice work everybody!