Add config stanza for NVIDIA RTX 2080. (huggingface#658)

Just happened to have this card on my Windows machine and verified that the SD demo works on it.

```
Average step time: 144.26142692565918ms/it
Clip Inference Avg time (ms) = (205.001 + 44.000) / 2 = 124.501
VAE Inference time (ms): 281.001

Total image generation time: 7.856997728347778sec
```

I'd love to add an API upstream to derive compiler tuning flags from a host device.

shark/iree_utils/vulkan_utils.py

@@ -58,6 +58,11 @@ def get_vulkan_triple_flag(extra_args=[]):
  print("Found Apple M2 Device. Using m1-moltenvk-macos")
  return "-iree-vulkan-target-triple=m1-moltenvk-macos"
  # Nvidia Targets
+ elif all(x in vulkan_device for x in ("RTX", "2080")):
+ print(
+ f"Found {vulkan_device} Device. Using turing-rtx2080-{system_os}"
+ )
+ return f"-iree-vulkan-target-triple=turing-rtx2080-{system_os}"
  elif all(x in vulkan_device for x in ("A100", "SXM4")):
  print(
  f"Found {vulkan_device} Device. Using ampere-rtx3080-{system_os}"