dm: x86: pci: Convert chromebook_link to use driver model for pci

Move chromebook_link over to driver model for PCI.

This involves:
- adding a uclass for platform controller hub
- removing most of the existing PCI driver
- adjusting how CPU init works to use driver model instead
- rename the lpc compatible string (it will be removed later)

This does not really take advantage of driver model fully, but it does work.
Furture work will improve the code structure to remove many of the explicit
calls to init the board.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/ivybridge/bd82x6x.c b/arch/x86/cpu/ivybridge/bd82x6x.c
index 56b19e3..7b74282 100644
--- a/arch/x86/cpu/ivybridge/bd82x6x.c
+++ b/arch/x86/cpu/ivybridge/bd82x6x.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>
 #include <malloc.h>
@@ -86,7 +87,7 @@
 	bd82x6x_pci_dev_enable_resources(dev);
 }
 
-int bd82x6x_init_pci_devices(void)
+static int bd82x6x_probe(struct udevice *dev)
 {
 	const void *blob = gd->fdt_blob;
 	struct pci_controller *hose;
@@ -144,3 +145,24 @@
 
 	return 0;
 }
+
+static const struct udevice_id bd82x6x_ids[] = {
+	{ .compatible = "intel,bd82x6x" },
+	{ }
+};
+
+U_BOOT_DRIVER(bd82x6x_drv) = {
+	.name		= "bd82x6x",
+	.id		= UCLASS_PCH,
+	.of_match	= bd82x6x_ids,
+	.probe		= bd82x6x_probe,
+};
+
+/*
+ * TODO(sjg@chromium.org): Move this to arch/x86/lib or similar when other
+ * boards also use a PCH
+ */
+UCLASS_DRIVER(pch) = {
+	.id		= UCLASS_PCH,
+	.name		= "pch",
+};