CONFIG_DTB_PIC32_MZDA_SK is not available for the selected architecture x86.
Result is shown for architecture mips

PIC32MZDA Starter Kit

configname: CONFIG_DTB_PIC32_MZDA_SK

Devicetree selection
└─>PIC32MZDA Starter Kit
In linux kernel since version 4.1 (release Date: 2015-06-21)