[nvidia-bluefield] Update the default topology for DPU SKUs (#19609)

- Why I did it
Update the default topology for all Nvidia Bluefield SKUs. The correct topology to be used for Smart Switch devices is t1-smartswitch.

- How I did it
Update default_sku file for all related SKUs

- How to verify it
Compile and run image. The default configuration should be generated for the t1-smartswitch topology.

device/nvidia-bluefield/arm64-nvda_bf-bf3comdpu/default_sku

@@ -1 +1 @@
-Nvidia-bf3-com-dpu appliance
+Nvidia-bf3-com-dpu t1-smartswitch