tree-wide: Sort includes

This was done by running a locally built clang-format with
https://github.com/llvm/llvm-project/pull/137617 and
https://github.com/llvm/llvm-project/pull/137840 applied on all .c
and .h files.

src/sysupdate/sysupdate-instance.h

@@ -8,9 +8,8 @@
 #include "sd-id128.h"
 
 #include "fs-util.h"
-#include "time-util.h"
-
 #include "sysupdate-partition.h"
+#include "time-util.h"
 
 typedef struct Resource Resource;
 typedef struct Instance Instance;