CONFIG_FSL_SOC_BOOKE is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Freescale Book-E Machine Type

configname: CONFIG_FSL_SOC_BOOKE

Linux Kernel Configuration
└─>Freescale Book-E Machine Type
In linux kernel since version 2.6.33 (release Date: 2010-02-24)