BCM2708: Added HiFiBerry Digi configuration option
It will be compiled as a module by default. This also
includes the WM8804 driver.

Signed-off-by: Daniel Matuschek <daniel@matuschek.net>
ASoC: wm8804: Set idle_bias_off to false
Idle bias has been change to remove warning on driver startup

Signed-off-by: Daniel Matuschek <daniel@matuschek.net>