configs: Set CPU vendor to M5 Simulator in apu_se.py

Other vendor strings causes, for some reason, bad addresses to be
computed when running the GPU model. This change reverts back to M5
Simulator only for apu_se.py.

Change-Id: I5992b4e31569f5c0e5e49e523908c8fa0602f845
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/66171
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
diff --git a/configs/example/apu_se.py b/configs/example/apu_se.py
index b33daa5..acf527b 100644
--- a/configs/example/apu_se.py
+++ b/configs/example/apu_se.py
@@ -740,6 +740,11 @@
         (cpu_list[i], future_cpu_list[i]) for i in range(args.num_cpus)
     ]
 
+# Other CPU strings cause bad addresses in ROCm. Revert back to M5 Simulator.
+for (i, cpu) in enumerate(cpu_list):
+    for j in range(len(cpu)):
+        cpu.isa[j].vendor_string = "M5 Simulator"
+
 # Full list of processing cores in the system.
 cpu_list = cpu_list + [shader] + cp_list