fix include order and unify local include placement

In commit https://github.com/linux-can/can-utils/commit/b153fe3f3591
("clang-tidy: sort includes alphabetically") the position of the "lib.h"
include has been moved in a way that struct canfd_frame has not been
defined anymore and lead to a warning when compiling cangen.c

This patch reverts that specific move and unifies the location of local
includes at the end of the include list.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>

canframelen.c

@@ -44,7 +44,6 @@
  *
  */
 
-#include "canframelen.h"
 #include <arpa/inet.h>
 #include <assert.h>
 #include <stdbool.h>
@@ -52,6 +51,8 @@
 #include <stdint.h>
 #include <string.h>
 
+#include "canframelen.h"
+
 /**
  * Functions and types for CRC checks.
  *