ARM: configs: aspeed_g4: Enable IPV6 options

Match the aspeed_g5 defconfig and what is used in OpenBMC.
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/configs/aspeed_g4_defconfig

@@ -47,7 +47,11 @@ CONFIG_INET=y
 CONFIG_IP_MULTICAST=y
 CONFIG_SYN_COOKIES=y
 # CONFIG_INET_DIAG is not set
+CONFIG_IPV6_ROUTER_PREF=y
+CONFIG_IPV6_ROUTE_INFO=y
+CONFIG_IPV6_OPTIMISTIC_DAD=y
 # CONFIG_IPV6_SIT is not set
+CONFIG_IPV6_MULTIPLE_TABLES=y
 CONFIG_NETFILTER=y
 # CONFIG_NETFILTER_ADVANCED is not set
 CONFIG_VLAN_8021Q=y