soc/intel/fsp_broadwell_de/vtd: Silence warning

Silence PCI resource warning due to missing set_resources.

Change-Id: I8253e9ca137bda1cdd1c06273679693c4b7803ec
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/30743
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/soc/intel/fsp_broadwell_de/vtd.c

@@ -34,6 +34,7 @@ static void vtd_read_resources(struct device *dev)
 
 static struct device_operations vtd_ops = {
 	.read_resources		= vtd_read_resources,
+	.set_resources		= DEVICE_NOOP,
 	.write_acpi_tables	= vtd_write_acpi_tables,
 };