UPSTREAM: ASoC: rt5682: Fix the boost volume at the begining of playback

This patch fixed the boost volume at the begining of playback
while DAC volume set to lower level.

Signed-off-by: Shuming Fan <shumingf@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 28b20dde)
Signed-off-by: Samaga Prasanna Krishna <samaga.krishna@intel.corp-partner.google.com>

BUG=b:110025789
TEST=Test Audio use cases with full SOF 0.6 rebase release series applied.

Change-Id: I0b2cce7b38ec1a8eb8321d7604262298255321c1
Reviewed-on: https://chromium-review.googlesource.com/1353738


Commit-Ready: Curtis Malainey <cujomalainey@chromium.org>
Tested-by: Hou-hsun Lee <hou-hsun.lee@intel.corp-partner.google.com>
Reviewed-by: Sathyanarayana Nujella <sathyanarayana.nujella@intel.com>
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>
Reviewed-by: Sudarshan S <sudarshan.s@intel.com>