Add o3-timing configuration for ALPHA_SE "Hello world" tests.

build_opts/ALPHA_SE:
    Add O3CPU to default CPU model list.
tests/SConscript:
    Add o3-timing configuration.

--HG--
extra : convert_revision : 378feacc07cefdaf1e2df9080c9b9d5d71e4d2a1

tests/SConscript

@@ -207,7 +207,7 @@ if env['FULL_SYSTEM']:
                         'tsunami-simple-atomic-dual',
                         'tsunami-simple-timing-dual']
 else:
-    configs += ['simple-atomic', 'simple-timing']
+    configs += ['simple-atomic', 'simple-timing', 'o3-timing']
 
 cwd = os.getcwd()
 os.chdir(str(Dir('.').srcdir))