net/mlx5e: SHAMPO, Always calculate page size

net/mlx5e: SHAMPO, Always calculate page size

Adapt the rx path in SHAMPO mode to calculate page size based on
configured page_shift when dealing with payload data.

This is necessary as an upcoming patch will add support for using
different page sizes.

This change has no functional changes.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260223204155.1783580-9-tariqt@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>