3DLUT on Icelake?

## System information
`Intel(R) Core(TM) i7-1065G7 CPU @ 1.30GHz`
`00:02.0 VGA compatible controller: Intel Corporation Iris Plus Graphics G7 (rev 07)`

## Issue behavior
### Describe the current behavior
Filters show that 3DLUT is present, but it then returns no capabilities.

vadumpcaps output:
```
{
"filter": 9,
"name": "3DLUT",
"types": [
],
},
```

### Describe the expected behavior
Either 3DLUT is present and it should return capabilities, or it isn't and the filter should not be visible at all.

The comment at https://github.com/intel/media-driver/blob/master/media_driver/linux/common/vp/ddi/media_libva_vp.c#L4517-L4518 suggests that it should be as Gen11+, but the following line then tests for Gen12+. I don't know which is right.

## Debug information
Current master iHD, git 4485349d8f056ccc3ebde978082c056c4666f014.