[libc++] Alphabetize and include-what-you-use. NFCI.

Differential Revision: https://reviews.llvm.org/D102781

NOKEYCHECK=True
GitOrigin-RevId: bfbd73f87d7b2c1140b43192cea6b7fbbfc35cd0
diff --git a/include/chrono b/include/chrono
index b6fbde4..6bdb929 100644
--- a/include/chrono
+++ b/include/chrono
@@ -823,13 +823,13 @@
 }  // std
 */
 
-#include <__config>
 #include <__availability>
+#include <__config>
 #include <compare>
 #include <ctime>
-#include <type_traits>
-#include <ratio>
 #include <limits>
+#include <ratio>
+#include <type_traits>
 #include <version>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)