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

Timer Counter Blocks (TCB) support


Linux Kernel Configuration
└─>AT91/Microchip SoCs
└─>Timer Counter Blocks (TCB) support
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Select this to get a high precision clocksource based on a
TC block with a 5+ MHz base clock rate.
On platforms with 16-bit counters, two timer channels are combined
to make a single 32-bit timer.
It can also be used as a clock event device supporting oneshot mode.