Global EN register guide to off before AMP_EN register
 when amp disable sequence.
  - remove AMP_EN control before max98390_dac_event call
Signed-off-by: Steve Lee <steves.lee@maximintegrated.com>
Link: https://lore.kernel.org/r/20200724060058.19201-1-steves.lee@maximintegrated.comSigned-off-by: Mark Brown <broonie@kernel.org>