base: Do not require an AssociativeCache to store a CacheEntry

As long as the AssociativeCache Entry parameter satisfies the
interface it should be fine. We enforce the bare minimum of having
a replaceable entry.
Doing otherwise will restrict our capability to have a generic cache
with generic tags

Change-Id: I23e32b7540fea6b6e5894aca3d91538e81214932
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>

src/base/cache/associative_cache.hh

@@ -62,8 +62,8 @@ class AssociativeCache : public Named
 {
   protected:
 
-    static_assert(std::is_base_of_v<CacheEntry, Entry>,
-                  "Entry should be derived from CacheEntry");
+    static_assert(std::is_base_of_v<ReplaceableEntry, Entry>,
+                  "Entry should be derived from ReplaceableEntry");
 
     typedef replacement_policy::Base BaseReplacementPolicy;
     typedef typename Entry::IndexingPolicy IndexingPolicy;