ASoC: kirkwood: Add audio support to hp t5325 thin clients

This patch is adding support for hp t5325 thin clients.
There's a alc5623 codec connected to the i2s interface.

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>