Update default model build spec

Author: VladimirUmek

model/aot_model.py

@@ -25,8 +25,8 @@ def forward(self, x: torch.Tensor, y: torch.Tensor) -> torch.Tensor:
 # explanation of its flags: https://gitlab.arm.com/artificial-intelligence/ethos-u/ethos-u-vela/-/blob/main/OPTIONS.md
 compile_spec = EthosUCompileSpec(
             target="ethos-u85-256",
-            system_config="Ethos_U55_High_End_Embedded",
-            memory_mode="Shared_Sram",
+            system_config="Ethos_U85_SYS_DRAM_Mid",
+            memory_mode="Sram_Only",
             extra_flags=["--output-format=raw", "--debug-force-regor"]
         )