Getting it working with rpm-ostree

On fedora kinoite/silverblue you have `rpm-ostree` and there is [no support for dkms yet](https://github.com/coreos/rpm-ostree/issues/1091). Soru had tried to build with the `Build outside kernel source tree` method in a toolbox and that worked, however, after insmod'ing the module, this is the dmesg output:

```
[ 121.407554] intel_ipu6: loading out-of-tree module taints kernel.
[ 121.407712] intel_ipu6: module verification failed: signature and/or required key missing - tainting kernel
[ 121.410343] intel-ipu6 intel-ipu: enabling device (0000 -> 0002)
[ 121.410608] intel-ipu6 intel-ipu: Device 0x465d (rev: 0x2)
[ 121.410711] intel-ipu6 intel-ipu: physical base address 0x603c000000
[ 121.410714] intel-ipu6 intel-ipu: mapped as: 0x000000004e3f88d7
[ 121.412625] intel-ipu6 intel-ipu: IPU in secure mode
[ 121.412632] intel-ipu6 intel-ipu: IPU secure touch = 0x0
[ 121.412633] intel-ipu6 intel-ipu: IPU camera mask = 0xff
[ 121.428923] intel-ipu6 intel-ipu: IPC reset done
[ 121.428939] intel-ipu6 intel-ipu: cpd file name: intel/ipu6ep_fw.bin
[ 121.429156] intel-ipu6 intel-ipu: Direct firmware load for intel/ipu6ep_fw.bin failed with error -2
[ 121.429167] intel-ipu6 intel-ipu: Requesting signed firmware failed
[ 121.429173] intel-ipu6: probe of intel-ipu failed with error -2
```

Any help would be greatly appreciated!