UCM config: glados and chell: Don't apply speaker EQ/DRC to headphones

Set the OutputDspName to empty for the Headphone jack, so that
get_active_dsp_name doesn't return the default "speaker_eq" dsp
for the headphone node.

BUG=chrome-os-partner:51560
TEST=On Chell set some extreme speaker EQ values in dsp.ini, listen
to headphone playback and confirm the speaker EQ/DRC is not applied.

Change-Id: Ib8309aa4a361e77156f225e734b6081589f82b2e
Signed-off-by: Ben Zhang <benzh@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/336031
Reviewed-by: Dylan Reid <dgreid@chromium.org>
1 file changed