defconfig: mdm9630: Enable audio

Enable Audio on mdm9630. Audio configs enable features
required for sound card to be enumerated. This enables
audio playback, record and voice calls.

Change-Id: Ia138355bee87dda7e713758beea7122c2b6c4043
Signed-off-by: Pradnya Chaphekar <pradnyac@codeaurora.org>