CRIS: Export csum_partial_copy_nocheck

Allows that symbol to be used in modules, and fixes
the following on allmodconfig:

ERROR: "csum_partial_copy_nocheck" [net/ipv6/ipv6.ko] undefined!

Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
diff --git a/arch/cris/kernel/crisksyms.c b/arch/cris/kernel/crisksyms.c
index 3908b94..e704f81 100644
--- a/arch/cris/kernel/crisksyms.c
+++ b/arch/cris/kernel/crisksyms.c
@@ -67,3 +67,4 @@
 #endif
 EXPORT_SYMBOL(csum_partial);
 EXPORT_SYMBOL(csum_partial_copy_from_user);
+EXPORT_SYMBOL(csum_partial_copy_nocheck);