RDMA/efa: Use API to get contiguous memory blocks aligned to device supported page size

Use the ib_umem_find_best_pgsz() and rdma_for_each_block() API when
registering an MR instead of coding it in the driver.

ib_umem_find_best_pgsz() is used to find the best suitable page size
which replaces the existing efa_cont_pages() implementation.
rdma_for_each_block() is used to iterate the umem in aligned contiguous
memory blocks.

Reviewed-by: Firas JahJah <[email protected]>
Reviewed-by: Yossi Leybovich <[email protected]>
Reviewed-by: Shiraz Saleem <[email protected]>
Signed-off-by: Gal Pressman <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>

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