Remove upstream fa checks (#29471)

Signed-off-by: mingyuanm <mingyuanm@nvidia.com>
Signed-off-by: Roger Wang <hey@rogerw.io>
Co-authored-by: Roger Wang <hey@rogerw.io>

vllm/model_executor/models/siglip2navit.py

@@ -255,12 +255,10 @@ class Siglip2Attention(nn.Module):
             dtype=torch.get_default_dtype(),
             attn_backend_override=attn_backend_override,
         )
-        self.use_upstream_fa = False
 
         self.attn_backend, self.flash_attn_varlen_func = (
             maybe_get_vit_flash_attn_backend(
                 self.attn_backend,
-                self.use_upstream_fa,
                 attn_backend_override=attn_backend_override,
             )
         )