CONFIG_ARCH_P720T is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_P720T.
Result is shown for kernelversion 6.5.1


modulename: board-p720t.ko

configname: CONFIG_ARCH_P720T

Linux Kernel Configuration
└─>CLPS711X/EP721X/EP731X Implementations
In linux kernel since version 2.6.12  
Say Y here if you intend to run this kernel on the ARM Prospector

source code: