CONFIG_DEBUG_MT8127_UART0 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Mediatek mt8127 UART0

configname: CONFIG_DEBUG_MT8127_UART0

Kernel low-level debugging port
└─>Mediatek mt8127 UART0
In linux kernel since version 3.19 (release Date: 2015-02-08)  
Say Y here if you want kernel low-level debugging support
for Mediatek mt8127 based platforms on UART0.