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

DB8500

modulename: db8500-cpufreq.ko

and/or

cpu-db8500.ko

configname: CONFIG_UX500_SOC_DB8500

Linux Kernel Configuration
└─>Ux500 SoC
└─>DB8500
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
source code:
/arch/arm/mach-ux500/