SMBIOS: Allow skipping default SMBIOS generation

The call to the `get_smbios_data` device operation is followed by
calls to unconditional default functions, which lacks flexibility.
Instead, have devices that implement `get_smbios_data` call these
default functions as needed.

Most `get_smbios_data` implementations are in mainboard code, and are
bound to the root device. The default functions only operate with PCI
devices because of the `dev->path.type != DEVICE_PATH_PCI` checks, so
calling these functions for non-PCI devices is unnecessary. QEMU also
implements `get_smbios_data` but binds it to the domain device, which
isn't PCI either.

Change-Id: Iefbf072b1203d04a98c9d26a30f22cfebe769eb4
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57366
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/drivers/wifi/generic/smbios.c b/src/drivers/wifi/generic/smbios.c
index 793349d..db22de9 100644
--- a/src/drivers/wifi/generic/smbios.c
+++ b/src/drivers/wifi/generic/smbios.c
@@ -9,6 +9,9 @@
 
 static int smbios_write_intel_wifi(struct device *dev, int *handle, unsigned long *current)
 {
+	if (dev->vendor != PCI_VENDOR_ID_INTEL)
+		return 0;
+
 	struct smbios_type_intel_wifi {
 		struct smbios_header header;
 		u8 str;
@@ -29,10 +32,9 @@
 
 int smbios_write_wifi_pcie(struct device *dev, int *handle, unsigned long *current)
 {
-	if (dev->vendor == PCI_VENDOR_ID_INTEL)
-		return smbios_write_intel_wifi(dev, handle, current);
-
-	return 0;
+	int len = smbios_write_intel_wifi(dev, handle, current);
+	len += get_smbios_data(dev, handle, current);
+	return len;
 }
 
 int smbios_write_wifi_cnvi(struct device *dev, int *handle, unsigned long *current)