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/shared/bootspec.c

@@ -2,8 +2,8 @@
 
 #include <unistd.h>
 
-#include "bootspec-fundamental.h"
 #include "bootspec.h"
+#include "bootspec-fundamental.h"
 #include "chase.h"
 #include "conf-files.h"
 #include "devnum-util.h"