Net: econet: Makefile: Remove deprecated kbuild goal definitions

Changed Makefile to use <modules>-y instead of <modules>-objs
because -objs is deprecated and not mentioned in
Documentation/kbuild/makefiles.txt.
Signed-off-by: Tracey Dent <tdent48227@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/econet/Makefile

@@ -4,4 +4,4 @@
 
 obj-$(CONFIG_ECONET) += econet.o
 
-econet-objs := af_econet.o
+econet-y := af_econet.o