RDMA/rxe: Add new RXE_READ_OR_WRITE_MASK

1) Replace (RXE_READ_MASK | RXE_WRITE_MASK) with RXE_READ_OR_WRITE_MASK.
2) Change (RXE_READ_MASK | RXE_WRITE_OR_SEND) to RXE_READ_OR_WRITE_MASK
   because we don't need to check RETH for RXE_SEND_MASK.

Link: https://lore.kernel.org/r/20210914080253.1145353-2-yangx.jy@fujitsu.com


Signed-off-by: Xiao Yang <yangx.jy@fujitsu.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>