RDMA/mlx5: Fix CC counters query for MPV

[ Upstream commit acd245b1e33fc4b9d0f2e3372021d632f7ee0652 ]

In case, CC counters are querying for the second port use the correct
core device for the query instead of always using the master core device.

Fixes: aac4492e ("IB/mlx5: Update counter implementation for dual port RoCE")
Signed-off-by: Patrisious Haddad <phaddad@nvidia.com>
Reviewed-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/9cace74dcf106116118bebfa9146d40d4166c6b0.1750064969.git.leon@kernel.org


Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>