CONFIG_MACH_DA8XX_DT is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Support DA8XX platforms using device tree

modulename: da8xx-dt.ko

configname: CONFIG_MACH_DA8XX_DT

Linux Kernel Configuration
└─>TI DaVinci Implementations
└─>Support DA8XX platforms using device tree
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say y here to include support for TI DaVinci DA850 based using
Flattened Device Tree. More information at
source code:
arch/arm/mach-davinci/da8xx-dt.c
selects
CONFIG_PINCTRL