The unmanaged flags PLATFORM_INIT indicates whether UDEV is done
initializing the device. We should not handle IP config changes
before that pointer.

This avoids codepaths that require the permanent MAC address of the
device. We should not freeze the permanent MAC address before
UDEV initialized the device, for two reasons:

- getting the permanent MAC address using ethtool is racy as
  UDEV might still rename the interface.
- freezing a fake permanent MAC address should only happen after
  UDEV is done configuring the MAC address of software devices.

    #0  0x000055555568bc7a in nm_device_update_permanent_hw_address (self=self@entry=0x555555f0fb70 [NMDeviceVeth], force_freeze=force_freeze@entry=1) at src/devices/nm-device.c:11817
    #1  0x000055555568c443 in nm_device_get_permanent_hw_address_full (self=self@entry=0x555555f0fb70 [NMDeviceVeth], force_freeze=force_freeze@entry=1, out_is_fake=out_is_fake@entry=0x0)
        at src/devices/nm-device.c:12227
    #2  0x000055555568cb06 in nm_device_get_permanent_hw_address (self=self@entry=0x555555f0fb70 [NMDeviceVeth]) at src/devices/nm-device.c:12237
    #3  0x000055555568cb50 in spec_match_list (self=0x555555f0fb70 [NMDeviceVeth], specs=0x555555a5c000 = {...}) at src/devices/nm-device.c:12294
    #4  0x00005555556a4ee6 in spec_match_list (device=0x555555f0fb70 [NMDeviceVeth], specs=0x555555a5c000 = {...}) at src/devices/nm-device-ethernet.c:1461
    #5  0x00005555556978db in nm_device_spec_match_list (self=self@entry=0x555555f0fb70 [NMDeviceVeth], specs=0x555555a5c000 = {...}) at src/devices/nm-device.c:12277
    #6  0x000055555558e187 in _match_section_infos_lookup (match_section_infos=0x555555a5d500, keyfile=0x555555a46f80, property=property@entry=0x555555793123 "ipv4.route-metric", device=device@entry=0x555555f0fb70 [NMDeviceVeth], out_value=out_value@entry=0x7fffffffe018) at src/nm-config-data.c:1169
    #7  0x00005555555922ca in nm_config_data_get_connection_default (self=0x555555a548c0 [NMConfigData], property=property@entry=0x555555793123 "ipv4.route-metric", device=device@entry=0x555555f0fb70 [NMDeviceVeth]) at src/nm-config-data.c:1234
    #8  0x00005555556790cd in _get_ipx_route_metric (self=self@entry=0x555555f0fb70 [NMDeviceVeth], is_v4=is_v4@entry=1) at src/devices/nm-device.c:1142
    #9  0x000055555567912e in nm_device_get_ip4_route_metric (self=self@entry=0x555555f0fb70 [NMDeviceVeth]) at src/devices/nm-device.c:1161
    #10 0x000055555567da6c in ip4_config_merge_and_apply (self=self@entry=0x555555f0fb70 [NMDeviceVeth], config=config@entry=0x0, commit=commit@entry=0, out_reason=out_reason@entry=0x0)
        at src/devices/nm-device.c:4787
    #11 0x000055555567e0fb in update_ip4_config (self=self@entry=0x555555f0fb70 [NMDeviceVeth], initial=initial@entry=0) at src/devices/nm-device.c:9532
    #12 0x0000555555693acd in queued_ip4_config_change (user_data=0x555555f0fb70) at src/devices/nm-device.c:9651
    #13 0x00007ffff4c966ba in g_main_context_dispatch (context=0x555555a46af0) at gmain.c:3154
    #14 0x00007ffff4c966ba in g_main_context_dispatch (context=context@entry=0x555555a46af0) at gmain.c:3769
    #15 0x00007ffff4c96a70 in g_main_context_iterate (context=0x555555a46af0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3840
    #16 0x00007ffff4c96d92 in g_main_loop_run (loop=0x555555a47400) at gmain.c:4034
    #17 0x000055555558372a in main (argc=<optimized out>, argv=<optimized out>) at src/main.c:411