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/bootctl/bootctl-set-efivar.c

@@ -5,8 +5,8 @@
 
 #include "bootctl.h"
 #include "bootctl-set-efivar.h"
-#include "efivars.h"
 #include "efi-loader.h"
+#include "efivars.h"
 #include "stdio-util.h"
 #include "utf8.h"
 #include "virt.h"