default or selected kernelversion does not have config value CONFIG_NET_SCH_CLK_GETTIMEOFDAY.
Result is shown for kernelversion 5.4.123



Packet scheduler clock source
In linux kernel since version 2.6.12  
Say Y here if you want to use gettimeofday as clock source. This clock
source has high resolution, is synchronized on all processors and
handles cpu clock frequency changes, but it is slow.

Choose this if you need a high resolution clock source but can't use
the CPU's cycle counter.