lib_generic/crc32.c: add missing #include <watchdog.h>

Signed-off-by: Wolfgang Denk <wd@denx.de>

lib_generic/crc32.c

@@ -13,6 +13,7 @@
 #else
 #include <stdint.h>
 #endif
+#include <watchdog.h>
 
 #include "zlib.h"