CONFIG_REALVIEW_DT is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Support RealView(R) Device Tree based boot
modulename: realview-dt.ko
configname: CONFIG_REALVIEW_DT
Linux Kernel Configuration
└─>RealView platform type
└─>Support RealView(R) Device Tree based boot
In linux kernel since version 3.19 (release Date: 2015-02-08)
Include support for booting the ARM(R) RealView(R) evaluation
boards using a device tree machine description.
boards using a device tree machine description.