sw64: change the value of physical_id in /proc/cpuinfo

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



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The value of physical_id in /proc/cpuinfo should be
the socket_id of the processor.

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

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