ramips: add D-Link DIR-620 A1 support

Full functionality runtime tested, installation via OEM web-interface requires
a follow-up patch.

Thanks go to Sergey Vasilyugin for his patch that pointed me at the missing
bits (including the antiparallel wps led).

Signed-off-by: Paul Fertser <fercerpav@gmail.com>

SVN-Revision: 33142

target/linux/ramips/base-files/lib/ramips.sh

@@ -80,6 +80,9 @@ ramips_board_name() {
 	*"DIR-600 B2")
 		name="dir-600-b2"
 		;;
+	*"DIR-620 A1")
+		name="dir-620-a1"
+		;;
         *"DAP-1350")
                 name="dap-1350"
                 ;;