vfio-pci: Cleanup BAR access

We can actually handle MMIO and I/O port from the same access function
since PCI already does abstraction of this.  The ROM BAR only requires
a minor difference, so it gets included too.  vfio_pci_config_readwrite
gets renamed for consistency.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/pci/vfio_pci_config.c

@@ -1501,9 +1501,8 @@ static ssize_t vfio_config_do_rw(struct vfio_pci_device *vdev, char __user *buf,
 	return ret;
 }
 
-ssize_t vfio_pci_config_readwrite(struct vfio_pci_device *vdev,
-				  char __user *buf, size_t count,
-				  loff_t *ppos, bool iswrite)
+ssize_t vfio_pci_config_rw(struct vfio_pci_device *vdev, char __user *buf,
+			   size_t count, loff_t *ppos, bool iswrite)
 {
 	size_t done = 0;
 	int ret = 0;