RDMA/hns: Use ib_umem_num_dma_blocks() instead of opencoding

mtr_umem_page_count() does the same thing, replace it with the core code.

Also, ib_umem_find_best_pgsz() should always be called to check that the
umem meets the page_size requirement. If there is a limited set of
page_sizes that work it the pgsz_bitmap should be set to that set. 0 is a
failure and the umem cannot be used.

Lightly tidy the control flow to implement this flow properly.

Link: https://lore.kernel.org/r/[email protected]
Acked-by: Weihang Li <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

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