ucm2: da7213: Fix mic capture in HeadphoneMic2 use case

ucm2: da7213: Fix mic capture in HeadphoneMic2 use case

Set Mic 2 Volume to index 4 (+18 dB) and Mixin PGA Volume to index
10 (+10.5 dB) for sufficient microphone capture gain.

Remove headphone output controls (Headphone Volume, Headphone Switch,
Mixout DAC switches) as these belong to HeadphoneEnableSeq.conf and
should not be duplicated in the capture sequence.

Closes: https://github.com/alsa-project/alsa-ucm-conf/pull/730
Signed-off-by: Le Qi <le.qi@oss.qualcomm.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>