misc/uacce: fixup out-of-bounds array write

driver inclusion
category: Bugfix
bugzilla: NA
CVE: NA

Size in uacce_alloc_dma_buffers api is from mmap size.
If size is too big, which can cause size + max_size - 1
overflow. Then ss_num is negative, uacce_sort_dma_buffers
api may cause out-of-bounds arraywrite.

Signed-off-by: Yu'an Wang <wangyuan46@huawei.com>
Signed-off-by: Kai Ye <yekai13@huawei.com>
Reviewed-by: Zhou Wang <wangzhou1@hisilicon.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>