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

Marvell Dove Flattened Device Tree

modulename: board-dt.ko

configname: CONFIG_MACH_DOVE_DT

Linux Kernel Configuration
└─>Marvell Dove Implementations
└─>Marvell Dove Flattened Device Tree
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say 'Y' here if you want your kernel to support the
Marvell Dove using flattened device tree.

source code:
arch/arm/mach-dove/board-dt.c