Implement spinlock on top of atomic api and remove up_testset

[xiaoxiang781216]

See the discussion here: #6283

[masayuki2009]

@xiaoxiang781216
For example, cxd56xx needs to use up_testset API because the SoC has a restriction to use ldrex and strex.

[xiaoxiang781216]

Yes, in your case not only up_testset, but also atomic_xxx need rewrite for cxd56xx. The issue description is still right, it's better to use atomic api directly, but implement atomic api has different approach:

1. boolchain's bultin
2. libs/libc/machine/arc_atomic. for single core
3. chip special one(e.g. cxd56xx)

[xiaoxiang781216]

@hujun260 please look at this problem too.