[ViPPET] Fix GPU device name check to support multiple GPU identifiers (#1501)

Author: ktaube26

tools/visual-pipeline-and-platform-evaluation-tool/vippet/video_encoder.py

@@ -153,7 +153,7 @@ def select_element(
             Selected encoder element string with properties, or None if not found
         """
         key = OTHER
-        if encoder_device.device_name == "GPU":
+        if encoder_device.device_name.startswith("GPU"):
             if encoder_device.gpu_id == 0:
                 key = GPU_0
             elif encoder_device.gpu_id is not None and encoder_device.gpu_id > 0: