pci: Convert TYPE_PCIE_ROOT_PORT to 3-phase reset

Convert the TYPE_PCIE_ROOT_PORT device to 3-phase reset; this is a
necessary precursor to converting any of its child classes.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20221125115240.3005559-4-peter.maydell@linaro.org

hw/pci-bridge/pcie_root_port.c

@@ -43,9 +43,10 @@ static void rp_write_config(PCIDevice *d, uint32_t address,
     pcie_aer_root_write_config(d, address, val, len, root_cmd);
 }
 
-static void rp_reset(DeviceState *qdev)
+static void rp_reset_hold(Object *obj)
 {
-    PCIDevice *d = PCI_DEVICE(qdev);
+    PCIDevice *d = PCI_DEVICE(obj);
+    DeviceState *qdev = DEVICE(obj);
 
     rp_aer_vector_update(d);
     pcie_cap_root_reset(d);
@@ -171,13 +172,14 @@ static void rp_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
 
     k->is_bridge = true;
     k->config_write = rp_write_config;
     k->realize = rp_realize;
     k->exit = rp_exit;
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
-    dc->reset = rp_reset;
+    rc->phases.hold = rp_reset_hold;
     device_class_set_props(dc, rp_props);
 }