vfio: platform: ignore missing reset if disabled at module init

If reset requirement was relaxed via module parameter, errors caused by
missing reset should not be propagated down to the vfio core.
Otherwise initialization will fail.

Signed-off-by: Tomasz Duszynski <tduszynski@marvell.com>
Fixes: 5f6c7e08

 ("vfio/platform: Use the new device life cycle helpers")
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20230131083349.2027189-1-tduszynski@marvell.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>