RDMA/rxe: Fix indentations and operators sytle

* Fix these up to always have the '+', and '|' on the continuing line
  which is the normal kernel style.
* Fix indentations correspondingly

NOTE: this patch also remove the 2 redundant plus in
IB_OPCODE_RD_FETCH_ADD and IB_OPCODE_RD_COMPARE_SWAP

Link: https://lore.kernel.org/r/20220105042605.14343-1-lizhijian@fujitsu.com
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>