platform: mellanox: Rename some init()/exit() functions for consistent naming

Currently some names of init()/exit() pairing function are not
consistent.

Rename pair mlxplat_pre_init()/mlxplat_post_exit() to respectively
mlxplat_logicdev_init()/mlxplat_logicdev_exit().

Rename pair mlxplat_post_init()/mlxplat_pre_exit() to respectively
mlxplat_platdevs_init()/mlxplat_platdevs_exit().

Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20231005075616.42777-4-vadimp@nvidia.com


Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>