kirkwood: disable the CONFIG_IP_ADVANCED_ROUTER kernel config override (#13702)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36937 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/kirkwood/config-3.3

@@ -87,7 +87,6 @@ CONFIG_HAVE_SPARSE_IRQ=y
 CONFIG_HW_RANDOM=y
 CONFIG_INET_LRO=y
 CONFIG_INITRAMFS_SOURCE=""
-# CONFIG_IP_ADVANCED_ROUTER is not set
 CONFIG_IP_PIMSM_V1=y
 CONFIG_IP_PIMSM_V2=y
 CONFIG_JBD2=y