Add copy and move constructors to SizedArray.

Change-Id: I5e05ae00ef224efbe0f48bc7114d7db85a52a05b
diff --git a/aos/containers/sized_array.h b/aos/containers/sized_array.h
index 264d466..0b8b447 100644
--- a/aos/containers/sized_array.h
+++ b/aos/containers/sized_array.h
@@ -30,6 +30,8 @@
   using const_reverse_iterator = typename array::const_reverse_iterator;
 
   constexpr SizedArray() = default;
+  SizedArray(const SizedArray &) = default;
+  SizedArray(SizedArray &&) = default;
   SizedArray &operator=(const SizedArray &) = default;
   SizedArray &operator=(SizedArray &&) = default;