share_pool: share_pool: Don't allow non-sp mmap in sp address range

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


CVE: NA

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The situation below is not allowed:

int *result = mmap(ADDR, sizeof(int), PROT_READ | PROT_WRITE,
	MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);

As share pool uses an independent UVA allocation algorithm, it may
produce an address that is conflicted with user-specified address.

Signed-off-by: Tang Yizhou <tangyizhou@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>