net/mlx5: Moving rmap logic to EQs

IRQs are being simplified in order to ease their sharing and any feature
specific object will be moved to upper layer.
Hence we move rmap object into eq_table.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>