NPU plugin support

[tkatila]

No description provided.

[tkatila]

Not tested on real hardware. Development done based on the kernel API and example listings from a real system.

[tkatila]

I dropped the preferred allocation policy as it would require more than one NPU to exist and that's not expected as the NPUs are tied to CPUs.

[tkatila]

Tested the plugin on a MeteorLake hardware. Plugin works ok: it registers the resource, container requesting the resources is started, and container gets the /dev/accel/ devices.
I also tried running some tests/demos. The results are mixed. Some pass while some don't.

I'll add a test Dockerfile into this PR and move this to "ready to review" state.

[tkatila]

Added a workload dockerfile and a job for it. The workload has a selection of tests that I've tested to work. There are also additional tests, but they require the NPU compiler & openvino runtime, which can be included, but they take such a long time to compile.

[mythi]

LGTM

[eero-t]

Minor nit-picks.

[tkatila]

Thanks for the review @eero-t. I fixed all but two that I objected to.

[eero-t]

Approved, assuming GPU->NPU typos will be fixed.

(Did not review the controller part, I'll leave that to somebody whole knows that functionality better.)

[eero-t]

These calls in the switch are all identical, so there could as well be just a single call after the switch?

[tkatila]

It could be written like so:

	// type switches can have only one type in a case so the same repeats for
	// all xDevicePlugin types.
	// TODO: implement receivers if more complex logic is needed.

	var image *string

	switch v := obj.(type) {
	case *DlbDevicePlugin:
		image = &v.Spec.Image
	case *DsaDevicePlugin:
		image = &v.Spec.Image
	case *FpgaDevicePlugin:
		image = &v.Spec.Image
	case *GpuDevicePlugin:
		image = &v.Spec.Image
	case *IaaDevicePlugin:
		image = &v.Spec.Image
	case *QatDevicePlugin:
		image = &v.Spec.Image
	case *SgxDevicePlugin:
		image = &v.Spec.Image
	case *NpuDevicePlugin:
		image = &v.Spec.Image
	default:
		return fmt.Errorf("%w: expected an xDevicePlugin object but got %T", errObjType, obj)
	}

	if len(*image) == 0 {
		*image = r.defaultImage
	}

But I'm not sure if it's any better.

[tkatila]

Rebased against current main. I also verified that everything still works against a real hw.