RDMA/rxe: Remove the member 'type' of struct rxe_mr

The member 'type' is included in both struct rxe_mr and struct ib_mr
so remove the duplicate one of struct rxe_mr.

Signed-off-by: Xiao Yang <yangx.jy@fujitsu.com>
Link: https://lore.kernel.org/r/20221021134513.17730-1-yangx.jy@fujitsu.com
Reviewed-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>