ptp_pch: Switch to use module_pci_driver() macro

Eliminate some boilerplate code by using module_pci_driver() instead of
init/exit, and, if needed, moving the salient bits from init into probe.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220207210730.75252-4-andriy.shevchenko@linux.intel.com


Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>