ASoC: wcd9330: Enable smartboost from codec

Enable smartboost for speaker configuration from codec. With this
configuration, the voltage will switch between 5V(boost voltage)
and Vbat(boost bypass mode) based on audio level. This allows for
an additional efficiency gain at lower audio levels when a boosted
voltage is not required.

Change-Id: I86f99cbd459bb62d836d24eb6be1e6c8b494b8eb
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>