[libcpu/arm64] add C11 atomic ticket spinlock (#8882)

* [libcpu/arm64] add C11 atomic ticket spinlock

Replace the former implementation of flag-based spinlock which is unfair

Besides, C11 atomic implementation is more readable (it's C anyway),
and maintainable. Cause toolchain can use their builtin optimization and
tune for different micro-architectures. For example armv8.5 introduces a
better instruction. The compiler can help with that when it knows your
target platform in support of it.

Signed-off-by: Shell <[email protected]>

* fixup: RT_CPUS_NR

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Signed-off-by: Shell <[email protected]>

0 files changed, 0 insertions, 0 deletions