Use rstl::find

Former-commit-id: 6c4971ec76

include/rstl/reserved_vector.hpp

@@ -81,13 +81,6 @@ public:
       --x0_count;
     }
   }
-
-  iterator find(const T& value) {
-    rstl::reserved_vector< TUniqueId, 8 >::iterator it = begin();
-    for (; it != end() && *it != value; ++it) {
-    }
-    return it;
-  }
 };
 } // namespace rstl