Udev may be slow at startup and it may take a while until the
device is visible in udev. Before that, there are no pending
actions yet because the device is still in unmanaged state.

Hack nm_device_has_pending_action() to indicate a pending action
when the platform link is not yet initialized.
We don't bother using nm_device_add_pending_action() to schedule
a proper pending-action. It is simpler this way, also we precisely
log about the state of NM_UNMANAGED_PLATFORM_INIT flag. The pending
actions are implemented in their way mostly for logging purpose to
understand what blocks a device. For NM_UNMANAGED_PLATFORM_INIT we
have sufficient logging so no need for the overhead and effort.

https://bugzilla.gnome.org/show_bug.cgi?id=779920