RDMA/siw: Fix 64/32bit pointer inconsistency

RDMA/siw: Fix 64/32bit pointer inconsistency

Fixes improper casting between addresses and unsigned types.
Changes siw_pbl_get_buffer() function to return appropriate
dma_addr_t, and not u64.

Also fixes debug prints. Now any potentially kernel private
pointers are printed formatted as '%pK', to allow keeping that
information secret.

Fixes: d941bfe500be ("RDMA/siw: Change CQ flags from 64->32 bits")
Fixes: 09f581643719 ("rdma/siw: completion queue methods")
Fixes: b729ba0e6e4a ("rdma/siw: receive path")
Fixes: 43654ff73ad1 ("rdma/siw: transmit path")
Fixes: 5541d7c69863 ("rdma/siw: queue pair methods")
Fixes: de1ad67d5654 ("rdma/siw: application buffer management")
Fixes: 519268203315 ("rdma/siw: application interface")
Fixes: 723753626e18 ("rdma/siw: connection management")
Fixes: bee545190559 ("rdma/siw: main include file")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reported-by: Jason Gunthorpe <jgg@ziepe.ca>
Reported-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Link: https://lore.kernel.org/r/20190822173738.26817-1-bmt@zurich.ibm.com
Signed-off-by: Doug Ledford <dledford@redhat.com>