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Since loongson3_smp_ops is not used in LoongArch anymore, let's remove
it for cleanup.

Fixes: f2ac457a

 ("LoongArch: Add CPU definition headers")
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>