Model: Auto-detect a one GPU setup and fix gpu_split_auto

It makes more sense to use gpu split parameters when the user has
>1 GPUs. Otherwise, set split and split_auto to False and save
the user some VRAM.

Signed-off-by: kingbri <bdashore3@proton.me>

OAI/types/model.py

@@ -70,7 +70,7 @@ class ModelLoadRequest(BaseModel):
         default=None,
         examples=[4096],
     )
-    gpu_split_auto: Optional[bool] = False
+    gpu_split_auto: Optional[bool] = True
     gpu_split: Optional[List[float]] = Field(
         default_factory=list, examples=[[24.0, 20.0]]
     )