sw64: switch to generic calibrate_delay()

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



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There is no need to use per cpu loops_per_jiffy, so we
remove loops_per_jiffy from struct cpuinfo_sw64.

Signed-off-by: Hang Xiaoqian <hangxiaoqian@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>