ASoC: Add new Realtek ALC5632 CODEC driver

This driver implements basic functionality, using I²C for the control
channel.

Signed-off-by: Leon Romanovsky <leon@leon.nu>
Signed-off-by: Andrey Danin <danindrey@mail.ru>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>