Net: phonet: 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/phonet/Makefile

 obj-$(CONFIG_PHONET) += phonet.o pn_pep.o
 
-phonet-objs := \
+phonet-y := \
 	pn_dev.o \
 	pn_netlink.o \
 	socket.o \
@@ -8,4 +8,4 @@ phonet-objs := \
 	sysctl.o \
 	af_phonet.o
 
-pn_pep-objs := pep.o pep-gprs.o
+pn_pep-y := pep.o pep-gprs.o