soc/amd/picasso/root_complex: add missing set_resources

The set_resources field in the root_complex_operations struct shouldn't
be NULL, but a pointer to noop_set_resources instead. This fixes the
error "PCI: 00:00.0 missing set_resources".

Change-Id: I2d9f3850b3051c92cd9c0f52f8570f4fd6133070
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49120
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/soc/amd/picasso/root_complex.c

@@ -264,6 +264,7 @@ static void root_complex_fill_ssdt(const struct device *device)
 
 static struct device_operations root_complex_operations = {
 	.read_resources		= read_resources,
+	.set_resources		= noop_set_resources,
 	.enable_resources	= pci_dev_enable_resources,
 	.acpi_fill_ssdt		= root_complex_fill_ssdt,
 };