vfio/pci: Remove unused struct 'vfio_pci_mmap_vma'

'vfio_pci_mmap_vma' has been unused since
commit aac6db75 ("vfio/pci: Use unmap_mapping_range()")

Remove it.
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20240727160307.1000476-1-linux@treblig.orgSigned-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/pci/vfio_pci_core.c

@@ -57,11 +57,6 @@ struct vfio_pci_vf_token {
 	int			users;
 };
 
-struct vfio_pci_mmap_vma {
-	struct vm_area_struct	*vma;
-	struct list_head	vma_next;
-};
-
 static inline bool vfio_vga_disabled(void)
 {
 #ifdef CONFIG_VFIO_PCI_VGA