net/mlx5e: Introduce mlx5e_rss_init_params

Introduce a dedicated structure to group RSS initialization parameters
that are only used during RSS creation, and drop the "init" prefix
from pkt_merge_param.

No functional changes.

Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/1759094723-843774-6-git-send-email-tariqt@nvidia.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>