soc/amd/picasso: Add .scan_bus operation for ACP device

This change adds `.scan_bus` device operation for ACP device to allow
mainboards to add devices under it.

BUG=b:157708581

Change-Id: I088bf81d7c7c5f59ade1d2f0dd24e5fc2b1ff876
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43542
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/picasso/acp.c

@@ -116,6 +116,7 @@ static struct device_operations acp_ops = {
 	.enable_resources = pci_dev_enable_resources,
 	.init = init,
 	.ops_pci = &pci_dev_ops_pci,
+	.scan_bus = scan_static_bus,
 	.acpi_name = acp_acpi_name,
 	.acpi_fill_ssdt = acp_fill_ssdt,
 };