package/network/config/gre: ipv6 gre kmod package name was wrong

Source package gre was depending on kmod-ip6-gre, however the actual
kernel module package that is created is kmod-gre6.  Therefore
update (source) package gre for ipv6 gre support.

Signed-off-by: Daniel Dickinson <openwrt@daniel.thecshore.com>

SVN-Revision: 48100

package/network/config/gre/Makefile

@@ -42,7 +42,7 @@ endef
 define Package/grev6
 $(call Package/gre/Default)
   TITLE:=Generic Routing Encapsulation (IPv6) config support
-  DEPENDS:=@(PACKAGE_gre) @IPV6 +kmod-ip6-gre
+  DEPENDS:=@(PACKAGE_gre) @IPV6 +kmod-gre6
 endef
 
 define Package/grev6/description