RDMA/hns: Modify the mapping attribute of doorbell to device

It is more general for ARM device drivers to use the device attribute to
map PCI BAR spaces.

Fixes: 9a443537 ("IB/hns: Add driver files for hns RoCE driver")
Link: https://lore.kernel.org/r/20211206133652.27476-1-liangwenpeng@huawei.comSigned-off-by: NYixing Liu <liuyixing1@huawei.com>
Signed-off-by: NWenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/hns/hns_roce_main.c

@@ -442,7 +442,7 @@ static int hns_roce_mmap(struct ib_ucontext *uctx, struct vm_area_struct *vma)
 	prot = vma->vm_page_prot;
 
 	if (entry->mmap_type != HNS_ROCE_MMAP_TYPE_TPTR)
-		prot = pgprot_noncached(prot);
+		prot = pgprot_device(prot);
 
 	ret = rdma_user_mmap_io(uctx, vma, pfn, rdma_entry->npages * PAGE_SIZE,
 				prot, rdma_entry);