RDMA/hns: Add mapped page count checking for MTR

[ Upstream commit 9ea9a53e ]

Add the mapped page count checking flow to avoid invalid page size when
creating MTR.

Fixes: 38389eaa ("RDMA/hns: Add mtr support for mixed multihop addressing")
Link: https://lore.kernel.org/r/1612517974-31867-4-git-send-email-liweihang@huawei.com


Signed-off-by: Xi Wang <wangxi11@huawei.com>
Signed-off-by: Weihang Li <liweihang@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Stable-dep-of: d586628b ("RDMA/hns: Fix the overflow risk of hem_list_calc_ba_range()")
Signed-off-by: Sasha Levin <sashal@kernel.org>