net/mlx5e: Change eth_proto parameter naming

eth_proto_cap parameter represents the supported link modes,
while eth_proto_admin refers to the configured ones.

The function get_advertising() retrieves the configured link
modes, thus we update its parameter name to eth_proto_admin.

Signed-off-by: Shahar Shitrit <shshitrit@nvidia.com>
Reviewed-by: Carolina Jubran <cjubran@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20250219114112.403808-5-tariqt@nvidia.com


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