net/mlx5: Use common mlx5_same_hw_devs function

net/mlx5: Use common mlx5_same_hw_devs function

Refactor duplicate hardware device comparison code to use the common
mlx5_same_hw_devs() function instead of reimplementing system GUID
comparison logic in multiple places.

This cleanup eliminates code duplication in:
- Bridge representor device comparison.
- TC hardware device comparison.

Using the centralized function improves maintainability and ensures
consistent behavior across the driver.

Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Shay Drori <shayd@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/1761211020-925651-2-git-send-email-tariqt@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>