[bugfix] add supports_v1 platform interface (#15417)

Signed-off-by: Joe Runde <Joseph.Runde@ibm.com>

vllm/platforms/rocm.py

@@ -12,8 +12,9 @@ from vllm.logger import init_logger
 from .interface import DeviceCapability, Platform, PlatformEnum, _Backend
 
 if TYPE_CHECKING:
-    from vllm.config import VllmConfig
+    from vllm.config import ModelConfig, VllmConfig
 else:
+    ModelConfig = None
     VllmConfig = None
 
 logger = init_logger(__name__)
@@ -249,3 +250,8 @@ class RocmPlatform(Platform):
             return torch.float8_e4m3fnuz
         else:
             return torch.float8_e4m3fn
+
+    @classmethod
+    def supports_v1(cls, model_config: ModelConfig) -> bool:
+        # V1 support on AMD gpus is experimental
+        return True