vfio/platform: remove unneeded parent_module attribute

The vfio core driver is now taking refcount on the provider drivers,
remove redundant parent_module attribute from vfio_platform_device
structure.
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Acked-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20210518192133.59195-3-mgurtovoy@nvidia.comSigned-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/platform/vfio_amba.c

@@ -59,7 +59,6 @@ static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
 	vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
 	vdev->get_resource = get_amba_resource;
 	vdev->get_irq = get_amba_irq;
-	vdev->parent_module = THIS_MODULE;
 	vdev->reset_required = false;
 
 	ret = vfio_platform_probe_common(vdev, &adev->dev);

drivers/vfio/platform/vfio_platform.c

@@ -50,7 +50,6 @@ static int vfio_platform_probe(struct platform_device *pdev)
 	vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
 	vdev->get_resource = get_platform_resource;
 	vdev->get_irq = get_platform_irq;
-	vdev->parent_module = THIS_MODULE;
 	vdev->reset_required = reset_required;
 
 	ret = vfio_platform_probe_common(vdev, &pdev->dev);

drivers/vfio/platform/vfio_platform_private.h

@@ -50,7 +50,6 @@ struct vfio_platform_device {
 	u32				num_irqs;
 	int				refcnt;
 	struct mutex			igate;
-	struct module			*parent_module;
 	const char			*compat;
 	const char			*acpihid;
 	struct module			*reset_module;