move CPUFREQ to generic configs

target/linux/avr32/config-default

target/linux/generic-2.6/config-2.6.21

target/linux/generic-2.6/config-2.6.25

target/linux/generic-2.6/config-2.6.28

target/linux/generic-2.6/config-2.6.30

target/linux/generic-2.6/config-2.6.31

target/linux/generic-2.6/config-2.6.32

target/linux/mpc52xx/config-2.6.30

target/linux/mpc83xx/config-default

target/linux/ppc40x/config-default

target/linux/ppc44x/config-default

target/linux/ps3/config-2.6.30

target/linux/pxa/config-default

target/linux/rdc/config-2.6.28

target/linux/rdc/config-2.6.30