share_pool: Rename sp_stat_idr to sp_proc_stat_idr

ascend inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4EUVI


CVE: NA

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We are going to redesign the accounting subsystem of share pool.
We need to disambiguate the meaning of sp_stat_idr, as we will
introduce an struct which representing per-spg statistics.

Signed-off-by: Tang Yizhou <tangyizhou@huawei.com>
Reviewed-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: Zhou Guanghui <zhouguanghui1@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>