[hip] Make graph command buffer as default for initialization (#16707)

diff --git a/experimental/hip/hip_device.c b/experimental/hip/hip_device.c
index 2834d8d..b65801e 100644
--- a/experimental/hip/hip_device.c
+++ b/experimental/hip/hip_device.c
@@ -104,7 +104,7 @@
   out_params->arena_block_size = 32 * 1024;
   out_params->event_pool_capacity = 32;
   out_params->queue_count = 1;
-  out_params->command_buffer_mode = IREE_HAL_HIP_COMMAND_BUFFER_MODE_STREAM;
+  out_params->command_buffer_mode = IREE_HAL_HIP_COMMAND_BUFFER_MODE_GRAPH;
   out_params->stream_tracing = false;
   out_params->async_allocations = true;
 }