net/mlx5: Add back multicast stats for uplink representor

stable inclusion
from stable-5.10.27
commit 0be13d01473a0bbbec47a5b316a1727d7c94e278
bugzilla: 51493

--------------------------------

[ Upstream commit a0723108 ]

The multicast counter got removed from uplink representor due to the
cited patch.

Fixes: 47c97e6b ("net/mlx5e: Fix multicast counter not up-to-date in "ip -s"")
Signed-off-by: Huy Nguyen <huyn@nvidia.com>
Reviewed-by: Daniel Jurgens <danielj@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by:   Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>