arm64: Enable KCSAN

This patch enables KCSAN for arm64, with updates to build rules
to not use KCSAN for several incompatible compilation units.

Recent GCC version(at least GCC10) made outline-atomics as the
default option(unlike Clang), which will cause linker errors
for kernel/kcsan/core.o. Disables the out-of-line atomics by
no-outline-atomics to fix the linker errors.

Meanwhile, as Mark said[1], some latent issues are needed to be
fixed which isn't just a KCSAN problem, we make the KCSAN depends
on EXPERT for now.

Tested selftest and kcsan_test(built with GCC11 and Clang 13),
and all passed.

[1] https://lkml.kernel.org/r/YadiUPpJ0gADbiHQ@FVFF77S0Q05N

Acked-by: Marco Elver <[email protected]> # kernel/kcsan
Tested-by: Joey Gouly <[email protected]>
Signed-off-by: Kefeng Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[[email protected]: added comment to justify EXPERT]
Signed-off-by: Catalin Marinas <[email protected]>

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