CONFIG_DT_EASY50712 is not available for the selected architecture x86.
Result is shown for architecture mips

Easy50712

modulename: easy50712.dtb.ko

configname: CONFIG_DT_EASY50712

Devicetree
└─>Easy50712
In linux kernel since version 3.1 (release Date: 2011-10-24)
source code:
/arch/mips/lantiq/dts/
selects
CONFIG_BUILTIN_DTB

depends
CONFIG_SOC_XWAY