configs,tests: Update configs to use compatible SE workloads.

If there's no more compatible workload than the base SEWorkload class it
will fall back to that for now.

Change-Id: Id27172c3074a7976823a891878ab9eecf6246c47
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/33901
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

configs/learning_gem5/part3/simple_ruby.py

@@ -89,8 +89,6 @@ thispath = os.path.dirname(os.path.realpath(__file__))
 binary = os.path.join(thispath, '../../../', 'tests/test-progs/threads/bin/',
                       isa, 'linux/threads')
 
-system.workload = SEWorkload()
-
 # Create a process for a simple "multi-threaded" application
 process = Process()
 # Set the command
@@ -101,6 +99,8 @@ for cpu in system.cpu:
     cpu.workload = process
     cpu.createThreads()
 
+system.workload = SEWorkload.init_compatible(binary)
+
 # Set up the pseudo file system for the threads function above
 config_filesystem(system)