net/mlx5e: remove declarations of mlx5e_shampo_{fill_umr,dealloc_hd}

net/mlx5e: remove declarations of mlx5e_shampo_{fill_umr,dealloc_hd}

These functions were recently removed by commit 24cf78c73831
("net/mlx5e: SHAMPO, Switch to header memcpy"), however,
their declarations were left behind.

This patch removes those declarations.

Flagged by review-prompts while I was exercising Orc mode locally.
Compile tested only.

Signed-off-by: Simon Horman <horms@kernel.org>
Reviewed-by: Joe Damato <joe@dama.to>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260206-shampo-v1-1-75b20c6657e5@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>