CONFIG_UX500_SOC_DB8500 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_UX500_SOC_DB8500 (not configurable)

modulename: cpu-db8500.ko

and/or

dbx500-cpufreq.ko

configname: CONFIG_UX500_SOC_DB8500

Linux Kernel Configuration
└─>ST-Ericsson U8500 Series
└─>UX500_SOC_DB8500
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
source code:
arch/arm/mach-ux500/cpu-db8500.c


is selected by
CONFIG_MFD_DB8500_PRCMU

is depended by
CONFIG_MACH_MOP500