CONFIG_ARCH_DAVINCI_DA850 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

DA850/OMAP-L138 based system

modulename: da850.ko

configname: CONFIG_ARCH_DAVINCI_DA850

Linux Kernel Configuration
└─>TI DaVinci Implementations
└─>DA850/OMAP-L138 based system
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
source code:
/arch/arm/mach-davinci/