Clatd changes for move of libipchecksum.

libipchecksum is becoming its own library in
frameworks/libs/net and its include files are no longer under
netutils/. Adjust clatd code accordingly.

Also reorder some include files as suggested by clang-format.

Test: m
Test: atest clatd_test
Test: connects to IPv6-only wifi, testipv4.com shows 10/10
Change-Id: I5e4c73065ce828123aef7e8851227f9bdf444ff9
diff --git a/translate.c b/translate.c
index 728acc3..22830d89 100644
--- a/translate.c
+++ b/translate.c
@@ -15,17 +15,17 @@
  *
  * translate.c - CLAT functions / partial implementation of rfc6145
  */
+#include "translate.h"
+
 #include <string.h>
 
-#include "netutils/checksum.h"
-
+#include "checksum.h"
 #include "clatd.h"
 #include "common.h"
 #include "config.h"
 #include "debug.h"
 #include "icmp.h"
 #include "logging.h"
-#include "translate.h"
 
 /* function: packet_checksum
  * calculates the checksum over all the packet components starting from pos