UPSTREAM: ASoC: rt5682: Remove HP volume control

This patch removed Headphone Playback Volume control.
Due to codec settings, we don't want the user to change HP analog gain.
The user could use DAC1 Playback Volume control to
change playback volume.

Signed-off-by: Shuming Fan <shumingf@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 3f24f37a)
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: Iab3fa1b66e29af830392b80ed04bde51aeaaf43b
Reviewed-on: https://chromium-review.googlesource.com/1353736


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>