net: dsa: Fix duplicate object rule

While adding switch.o to the list of DSA object files, we essentially
duplicated the previous obj-y line and just added switch.o, remove the
duplicate.

Fixes: f515f19 ("net: dsa: add switch notifier")
Signed-off-by: Florian Fainelli <[email protected]>
Reviewed-by: Vivien Didelot <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: ffainelli

net/dsa/Makefile

@@ -1,6 +1,5 @@
 # the core
 obj-$(CONFIG_NET_DSA) += dsa_core.o
-dsa_core-y += dsa.o slave.o dsa2.o
 dsa_core-y += dsa.o slave.o dsa2.o switch.o
 
 # tagging formats