net: yaip: Add utility functions to check IPv6 addresses

IPv6 utility functions that check if a given IPv6 address
belongs to one of host network interfaces, and whether
the address is a given type.

Change-Id: If251534ae0af41963d45e305e7ba505a940d2fdc
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>