ANDROID: fix crc issue in net/ipv4/inet_fragment.c

In commit 7d056784 ("inet: inet_defrag: prevent sk release while
still in use") a new include file is added, which messes up the crc
generation of some of the exported symbols in net/ipv4/inet_fragment.c.
Fix this up by only including it when NOT generating the crc values.

Bug: 161946584
Fixes: 7d056784 ("inet: inet_defrag: prevent sk release while still in use")
Change-Id: Ifef668d676faed4c9b96a481807b7d000e5c39db
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>