ASoC: rt5645: Modify the headphone depop and calibration function to prevent the pop sound in the booting time

Remove the original calibration function and modify the depop and
calibration function to prevent the pop sound in the booting time.
Signed-off-by: NOder Chiou <oder_chiou@realtek.com>
Signed-off-by: NMark Brown <broonie@kernel.org>