CONFIG_SH_TMU is not available for thedefaultarchitecture x86.
Result is shown for architecture sh
default or selected kernelversion does not have config value CONFIG_SH_TMU.
Result is shown for kernelversion 5.3.7

TMU timer support

modulename: timer-tmu.ko

configname: CONFIG_SH_TMU

Linux/SuperH Kernel Configuration
└─>System type
└─>Timer and clock configuration
└─>TMU timer support
In linux kernel since version 2.6.16 (release Date: 2006-03-19)  
This enables the use of the TMU as the system timer.

source code: