dashboard/config/linux: consider enabling CONFIG_DEBUG_ATOMIC

https://lkml.kernel.org/r/51ebf844e006ca0de408f5d3a831e7b39d7fc31c.1768281748.git.fthain@linux-m68k.org looks interesting but may be coming with a significant performance overhead.

The questions:
1. What is the performance overhead of this check?
2. Can we find at least 1 bug on x86_64 platform fuzzing locally?
3. Can we find at least 1 bug on the ARM platform fuzzing locally?
