modules: echo module was moved between 3.14 and 3.18

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45248 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/kernel/linux/modules/other.mk

@@ -969,7 +969,8 @@ define KernelPackage/echo
   SUBMENU:=$(OTHER_MENU)
   TITLE:=Line Echo Canceller
   KCONFIG:=CONFIG_ECHO
-  FILES:=$(LINUX_DIR)/drivers/misc/echo/echo.ko
+  FILES:=$(LINUX_DIR)/drivers/staging/echo/echo.ko@lt3.18 \
+	  $(LINUX_DIR)/drivers/misc/echo/echo.ko@ge3.18
   AUTOLOAD:=$(call AutoLoad,50,echo)
 endef