inorder: make InOrder CPU FS compilable/visible

make syscall a SE mode only functionality
copy over basic FS functions (hwrei) to make FS compile

tests/SConscript

@@ -270,7 +270,8 @@ if env['FULL_SYSTEM']:
                     'tsunami-simple-atomic-dual',
                     'tsunami-simple-timing-dual',
                     'twosys-tsunami-simple-atomic',
-                    'tsunami-o3', 'tsunami-o3-dual']
+                    'tsunami-o3', 'tsunami-o3-dual',
+                    'tsunami-inorder']
     if env['TARGET_ISA'] == 'sparc':
         configs += ['t1000-simple-atomic',
                     't1000-simple-timing']