CONFIG_MACH_MT6589 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

MediaTek MT6589 SoCs support

configname: CONFIG_MACH_MT6589

Linux Kernel Configuration
└─>MediaTek SoC Support
└─>MediaTek MT6589 SoCs support
In linux kernel since version 4 (release Date: 2015-04-12)