6rd: Remove sourcerouting parameter registration

Commit 31214c38c8dd0f70366b523f9b0335145b9386bd removes IPv6 unneeded source-dest-routing workarounds;
as a result sourcerouting parameter is unused and can be removed.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

SVN-Revision: 45939

package/network/ipv6/6rd/files/6rd.sh

@@ -94,7 +94,6 @@ proto_6rd_init_config() {
 	proto_config_add_string "ip6prefixlen"
 	proto_config_add_string "ip4prefixlen"
 	proto_config_add_string "tunlink"
-	proto_config_add_boolean "sourcerouting"
 	proto_config_add_string "zone"
 }