util/nvmutil: sort includes alphabetically

small nitpick, but i try to use openbsd style
since i like that style. upon further reading
of their style guidelines today, it was revealed
to me that for includes, they:

* sort sys/ includes alphabetically, at the top
* after sys/ includes, have an empty line
* includes for networking-related headers below that
* empty space below networking headers if there
* after that, have the rest of the includes, sorted
  alphabetically

at least, that is my understanding. i have to admit,
it does look cleaner

not really that critical but why not do it?

util/nvmutil/nvmutil.c

@@ -26,16 +26,17 @@
  * https://libreboot.org/docs/install/nvmutil.html
  */
 
-#include <stdint.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <fcntl.h>
 #include <sys/stat.h>
-#include <unistd.h>
-#include <errno.h>
+
 #include <dirent.h>
 #include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
 
 void readGbeFile(int *fd, const char *path, int flags,
 	size_t nr);