x86: Support a fake PCI device with of-platdata-inst

With TPL we don't need full PCI support and it adds to code size. Instead,
a simple_bus driver is good enough to be able to read and write the PCI
config and do a little basic setup.

So at present there are two drivers in U-Boot called pci_x86. One is in
UCLASS_PCI, used in SPL and U-Boot proper. The other is in
UCLASS_SIMPLE_BUS and used only in TPL.

Add a tag to tell dtoc about this, so it knows which one to use when
generating the devices and uclasses.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Signed-off-by: NSimon Glass <sjg@chromium.org>

arch/x86/lib/tpl.c

@@ -150,5 +150,6 @@ U_BOOT_DRIVER(pci_x86) = {
 	.name	= "pci_x86",
 	.id	= UCLASS_SIMPLE_BUS,
 	.of_match = of_match_ptr(tpl_fake_pci_ids),
+	DM_PHASE(tpl)
 };
 #endif