sw64: simplify cpumask_of_node

Sunway inclusion
category: performance
bugzilla: https://gitee.com/openeuler/kernel/issues/I56OLG



--------------------------------

Simplify cpumask_of_node if CONFIG_DEBUG_PER_CPU_MAPS is not set to
improve performance.

Signed-off-by: Mao Minkai <maominkai@wxiat.com>

Signed-off-by: Gu Zitao <guzitao@wxiat.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>