nixos/fwupd: add polkit dependency
nixos/fwupd: add polkit dependency

We are building fwupd daemon with polkit support which means
polkit daemon is required.

Previously polkit was enabled by default via udisks2 but that
stopped with https://github.com/NixOS/nixpkgs/commit/f7637100655127dffbe14011b45be6a71f0e203d
breaking the fwupd installed tests as a result.

Let’s add the polkit dependency to the fwupd module to ensure polkit is available.

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