ASoC: twl6040: Convert HF and HS drivers to use DAPM OUT_DRV widget

Make the phoenix HS and HF drivers use the new DAPM driver
widget in order to guarantee power ON/OFF order sequence.

Signed-off-by: Margarita Olaya Cabrera <magi.olaya@ti.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>