another round of kernel config cleanups

target/linux/adm5120/router_be/config-2.6.28

target/linux/adm5120/router_be/config-2.6.30

target/linux/adm5120/router_be/config-2.6.31

target/linux/adm5120/router_le/config-2.6.28

target/linux/adm5120/router_le/config-2.6.30

target/linux/adm5120/router_le/config-2.6.31

target/linux/amazon/config-2.6.21

target/linux/ar7/config-default

target/linux/ar71xx/config-2.6.28

target/linux/ar71xx/config-2.6.30

target/linux/ar71xx/config-2.6.31

target/linux/at91/config-2.6.25

target/linux/atheros/config-2.6.30

target/linux/atheros/config-2.6.31

target/linux/au1000/au1500/config-default

target/linux/au1000/au1550/config-default

target/linux/avr32/config-default

target/linux/brcm47xx/config-2.6.28

target/linux/brcm47xx/config-2.6.30

target/linux/brcm47xx/config-2.6.31