x86: config: Init PCI before SPI

Since the ICH SPI controller uses PCI, we must ensure that PCI is available
before it is inited.

This fixes the current "ICH SPI: Cannot find device" message on boot.

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

include/configs/coreboot.h

@@ -41,6 +41,7 @@
 #define CONFIG_INTEL_CORE_ARCH	/* Sandy bridge and ivy bridge chipsets. */
 #define CONFIG_ZBOOT_32
 #define CONFIG_PHYSMEM
+#define CONFIG_SYS_EARLY_PCI_INIT
 
 #define CONFIG_LMB
 #define CONFIG_OF_LIBFDT