cpu: Add CPU metadata om the Python classes

The configuration scripts currently hard-code the requirements of each
CPU. This is clearly not optimal as it makes writing new configuration
scripts painful and adding new CPU models requires existing scripts to
be updated. This patch adds the following class methods to the base
CPU and all relevant CPUs:

 * memory_mode -- Return a string describing the current memory mode
                  (invalid/atomic/timing).

 * require_caches -- Does the CPU model require caches?

 * support_take_over -- Does the CPU support CPU handover?

src/cpu/BaseCPU.py

@@ -100,6 +100,25 @@ class BaseCPU(MemObject):
     void flushTLBs();
 ''')
 
+    @classmethod
+    def memory_mode(cls):
+        """Which memory mode does this CPU require?"""
+        return 'invalid'
+
+    @classmethod
+    def require_caches(cls):
+        """Does the CPU model require caches?
+
+        Some CPU models might make assumptions that require them to
+        have caches.
+        """
+        return False
+
+    @classmethod
+    def support_take_over(cls):
+        """Does the CPU model support CPU takeOverFrom?"""
+        return False
+
     def takeOverFrom(self, old_cpu):
         self._ccObject.takeOverFrom(old_cpu._ccObject)