Remove DSA

DSA is distributed switch architecture. it's used to support some
new dsa chipset. not used in windcharger.

Change-Id: Ica32a26fee6b79eb0ab65c588e482023938cc6d2
diff --git a/arch/mips/configs/gfwc100_defconfig b/arch/mips/configs/gfwc100_defconfig
index f2d02c3..a5b60cb 100644
--- a/arch/mips/configs/gfwc100_defconfig
+++ b/arch/mips/configs/gfwc100_defconfig
@@ -108,7 +108,6 @@
 CONFIG_IP6_NF_RAW=y
 CONFIG_BRIDGE=y
 # CONFIG_BRIDGE_IGMP_SNOOPING is not set
-CONFIG_NET_DSA=y
 CONFIG_VLAN_8021Q=y
 CONFIG_NET_SCHED=y
 CONFIG_NET_SCH_HFSC=y