share_pool: Fix address checker

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


CVE: NA

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Address range [MMAP_SHARE_POOL_START, MMAP_SHARE_POOL_16G_START) and
[MMAP_SHARE_POOL_16G_START, MMAP_SHARE_POOL_16G_START +
MMAP_SHARE_POOL_16G_SIZE) is always valid.

Signed-off-by: Peng Wu <wupeng58@huawei.com>
Signed-off-by: Tang Yizhou <tangyizhou@huawei.com>
Reviewed-by: Ding Tianhong <dingtianhong@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>