net: yaip: Setting preferred status to manually added IPv4 address

If user is setting the IPv4 address to a given network interface
manually and when lifetime is set to infinite, then set the
state of the address to preferred.

Change-Id: If6e331ac5655d0df0d3b67bb07bcf8cd06351e3d
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>