People wishing to build based on your PR can always download a patch from https://patch-diff.githubusercontent.com/raw/openwrt/openwrt/pull/1955.patch (add .patch to the PR URL). It then can be locally applied with something like git am 1955.patch. I would suggest checking out a new branch before applying the patch, rather than applying it directly to the local copy of master.
Edit:
The above URL comes from taking the PR URL https://github.com/openwrt/openwrt/pull/1955 and adding the .patch extension to get https://github.com/openwrt/openwrt/pull/1955.patch (which then redirects to the patch content URL, shown above).