drivers/ieee802154: Add missing parameter to net_if_set_link_addr()

Add the link type to net_if_set_link_addr() call. This fixes the
driver after changes introduced in
4eb20200.

Change-Id: I72475a055ac805524b4b0f0c2380513e8f041368
Signed-off-by: Wojciech Bober <wojciech.bober@nordicsemi.no>