default or selected kernelversion does not have config value CONFIG_H8300_TMR8.
Result is shown for kernelversion 6.7.7

Clockevent timer for the H8300 platform

modulename: h8300_timer8.ko

configname: CONFIG_H8300_TMR8

Linux Kernel Configuration
└─>Device Drivers
└─>Clock Source drivers
└─>Clockevent timer for the H8300 platform
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This enables the 8 bits timer for the H8300 platform.

source code: