Pinned OpenWrt feed hashes for realtek/rtl930x on snapshot and 25.12.5,
generated with nix-openwrt-imagebuilder's release2nix.
Expanding the feeds locally (rather than relying on upstream's index-level
hashes) keeps every package a plain pinned fetchurl, and removes the
import-from-derivation that would otherwise make evaluation depend on the
OpenWrt download server.
