vga_switcheroo: Use pci_is_display()

The inline pci_is_display() helper does the same thing. Use it.

Suggested-by: Bjorn Helgaas <[e-mail]>
Signed-off-by: Mario Limonciello <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>
Reviewed-by: Daniel Dadap <[e-mail]>
Reviewed-by: Simona Vetter <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

drivers/gpu/vga/vga_switcheroo.c

···
  */
 bool vga_switcheroo_client_probe_defer(struct pci_dev *pdev)
 {
-	if ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
+	if (pci_is_display(pdev)) {
 		/*
 		 * apple-gmux is needed on pre-retina MacBook Pro
 		 * to probe the panel if pdev is the inactive GPU.