config: kona: add default value for ADC2_MIXER Switch

When restarting audioserver during SVA session, the default value
of ADC2_MIXER Swtich is not set to default value and cause SVA fail
to detect anything. Add default value for this mixer control.

Change-Id: I13875bc0b2b995c3c8a00b615f560859c8e4caaa
2 files changed