soc/pci_devs.h: Use consistent naming in soc/pci_devs.h

This patch to make common PCI device name between APL and SKL.

Change-Id: I5e4c7502e9678c0a367e9c7a96cf848d5b24f68e
Signed-off-by: Barnali Sarkar <barnali.sarkar@intel.com>
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/18576
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/intel/apollolake/graphics.c

@@ -28,7 +28,7 @@
 
 uintptr_t fsp_soc_get_igd_bar(void)
 {
-	return find_resource(IGD_DEV, PCI_BASE_ADDRESS_2)->base;
+	return find_resource(SA_DEV_IGD, PCI_BASE_ADDRESS_2)->base;
 }
 
 static void igd_set_resources(struct device *dev)