ell: upgrade 0.43 -> 0.44

ver 0.44:
        Fix issue with allowing zero byte input for AEAD cipher.
        Fix issue with filling in DNS info in DHCP lease objects.
        Add support neighbor discovery utility helpers.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>