soc/intel: add IS_ENABLED() around Kconfig symbol references

Change-Id: I3c5f9e0d3d1efdd83442ce724043729c8648ea64
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/20348
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/soc/intel/broadwell/serialio.c b/src/soc/intel/broadwell/serialio.c
index a73312c..eb70112 100644
--- a/src/soc/intel/broadwell/serialio.c
+++ b/src/soc/intel/broadwell/serialio.c
@@ -40,7 +40,7 @@
 
 static int serialio_uart_is_debug(struct device *dev)
 {
-#if CONFIG_INTEL_PCH_UART_CONSOLE
+#if IS_ENABLED(CONFIG_INTEL_PCH_UART_CONSOLE)
 	switch (dev->path.pci.devfn) {
 	case PCH_DEVFN_UART0: /* UART0 */
 		return !!(CONFIG_INTEL_PCH_UART_CONSOLE_NUMBER == 0);
@@ -277,7 +277,7 @@
 {
 	pci_dev_set_resources(dev);
 
-#if CONFIG_INTEL_PCH_UART_CONSOLE
+#if IS_ENABLED(CONFIG_INTEL_PCH_UART_CONSOLE)
 	/* Update UART base address if used for debug */
 	if (serialio_uart_is_debug(dev)) {
 		struct resource *res = find_resource(dev, PCI_BASE_ADDRESS_0);