dashboard/config/linux: kcsan: do not pretend writes are atomic

Do not pretend writes are atomic. While this may currently be a
prevailing preference in the community, it does hide more interesting
bugs [1].

Since we moderate data races anyway, and are still drowning in data
races, a few more won't hurt.

What it does help with, however, is getting better signals about harmful
data races. Most of the read/write data races provide weak signals, but
write/write data races should provide a stronger harmfulness signal [1],
which will help us in selecting data races to investigate further.

[1] https://googleprojectzero.blogspot.com/2021/10/how-simple-linux-kernel-memory.html

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