ASoC: rt5677: Wait for DSP to boot before loading firmware

Wait for hardware to startup. If we load before hardware is ready we
could end up corrupting the firmware.

Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
Link: https://lore.kernel.org/r/20191106011335.223061-12-cujomalainey@chromium.org


Signed-off-by: Mark Brown <broonie@kernel.org>