ar71xx: refresh kernel config

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46438 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ar71xx/config-4.1

@@ -302,7 +302,6 @@ CONFIG_PCI_DOMAINS=y
 CONFIG_PERF_USE_VMALLOC=y
 CONFIG_PGTABLE_LEVELS=2
 CONFIG_PHYLIB=y
-# CONFIG_RCU_EXPEDITE_BOOT is not set
 # CONFIG_RCU_STALL_COMMON is not set
 CONFIG_RTL8306_PHY=y
 CONFIG_RTL8366RB_PHY=y