Libpci < 2.2.4 can not store class info in struct pci_dev

Read class info manually and store it in a separate variable.

Corresponding to flashrom svn r1004.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>

board_enable.c

@@ -789,9 +789,11 @@ static int intel_ich_gpio_set(int gpio, int raise)
 
 	/* First, look for a known LPC bridge */
 	for (dev = pacc->devices; dev; dev = dev->next) {
-		pci_fill_info(dev, PCI_FILL_CLASS);
+		uint16_t device_class;
+		/* libpci before version 2.2.4 does not store class info. */
+		device_class = pci_read_word(dev, PCI_CLASS_DEVICE);
 		if ((dev->vendor_id == 0x8086) &&
-		    (dev->device_class == 0x0601)) { /* ISA Bridge */
+		    (device_class == 0x0601)) { /* ISA Bridge */
 			/* Is this device in our list? */
 			for (i = 0; intel_ich_gpio_table[i].id; i++)
 				if (dev->device_id == intel_ich_gpio_table[i].id)