soc/intel/*: drop UART pad configuration from common code

UART pad configuration should not be done in common code, because that
may cause short circuits, when the user sets a wrong UART index.

Since all boards do pad setup on their own now, finally drop the pad
configuration from SoC common code.

Change-Id: Id03719eb8bd0414083148471ed05dea62a895126
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48829
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lance Zhao

src/include/device/pci_type.h

@@ -16,7 +16,8 @@ typedef u32 pci_devfn_t;
 	(((DEV) & 0x1F) << 15) | \
 	(((FN)  & 0x07) << 12))
 
-#define PCI_DEV_INVALID (0xffffffffU)
+#define PCI_DEV_INVALID   (0xffffffffU)
+#define PCI_DEVFN_INVALID (0xffffffffU)
 
 #if 1
 /* FIXME: For most of the time in ramstage, we get valid device pointer