x86: config: Enable plug-and-play for link PCI

Enable this option so that we can configure the available PCI devices. Also
make sure that PCI is available early after relocation as we use it for
several other subsystems.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/configs/chromebook_link.h

@@ -66,6 +66,9 @@
 #define CONFIG_PCI_IO_PHYS	CONFIG_PCI_IO_BUS
 #define CONFIG_PCI_IO_SIZE	0xefff
 
+#define CONFIG_SYS_EARLY_PCI_INIT
+#define CONFIG_PCI_PNP
+
 #define CONFIG_STD_DEVICES_SETTINGS     "stdin=usbkbd,vga,serial\0" \
 					"stdout=vga,serial\0" \
 					"stderr=vga,serial\0"