intel/wifi: Include conditionally in the build

Keep this enabled by default as most x86 platforms could have PCI-e
slots equipped with one of these Intel WiFi adapters.

The Kconfig entries under google boards had no function previously,
the variable was never referenced.

Change-Id: I728ce3fd83d51d4e5e32b848a2079c5fcee29349
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/15931
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
diff --git a/src/drivers/intel/wifi/wifi.c b/src/drivers/intel/wifi/wifi.c
index 5661bf4..789d0d5 100644
--- a/src/drivers/intel/wifi/wifi.c
+++ b/src/drivers/intel/wifi/wifi.c
@@ -25,6 +25,7 @@
 #include <wrdd.h>
 #include "chip.h"
 
+#if IS_ENABLED(CONFIG_GENERATE_SMBIOS_TABLES)
 static int smbios_write_wifi(struct device *dev, int *handle,
 			     unsigned long *current)
 {
@@ -55,6 +56,7 @@
 	*handle += 1;
 	return len;
 }
+#endif
 
 #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
 static void intel_wifi_fill_ssdt(struct device *dev)
@@ -125,7 +127,9 @@
 	.set_resources            = pci_dev_set_resources,
 	.enable_resources         = pci_dev_enable_resources,
 	.init                     = pci_dev_init,
+#if IS_ENABLED(CONFIG_GENERATE_SMBIOS_TABLES)
 	.get_smbios_data          = smbios_write_wifi,
+#endif
 	.ops_pci                  = &pci_ops,
 #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
 	.acpi_name                = &intel_wifi_acpi_name,