riscv: atomic: Cleanup unnecessary definition
The cmpxchg32 & cmpxchg32_local are not used in Linux anymore. So clean up asm/cmpxchg.h. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org> Link: https://lore.kernel.org/r/20220505035526.2974382-2-guoren@kernel.orgSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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