ruby: replaces Time with Cycles in many places

The patch started of with replacing Time with Cycles in the Consumer class.
But to get ruby to compile, the rest of the changes had to be carried out.
Subsequent patches will further this process, till we completely replace
Time with Cycles.

src/mem/ruby/slicc_interface/AbstractCacheEntry.hh

@@ -52,8 +52,6 @@ class AbstractCacheEntry : public AbstractEntry
     void changePermission(AccessPermission new_perm);
 
     Address m_Address; // Address of this block, required by CacheMemory
-    Time m_LastRef; // Last time this block was referenced, required
-                    // by CacheMemory
     int m_locked; // Holds info whether the address is locked,
                   // required for implementing LL/SC
 };