ubus: Use device_find to find a device when displaying device info

ubus: Use device_find to find a device when displaying device info

Replace device_get by device_find in netifd_dev_status as device_get
will fail to find the device if it's created via config as an aliased
vlan device in dotted notation (eg @iface.200).
In such case get_vlan_device_chain will figure out the layer3 device
but get_vlan_device will not find the vlan device in the dependency
list of the layer 3 device as it has been created as a dependency of
the aliased device.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>