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Different headphones have different impedance that results in volume level difference on ears as lower impedance headphone will have higher volume with the same gain on PAs. Provide impedance of headphones to be able to adjust gain according to impedance so user can have consistent volume level with different headphones. Change-Id: I707f34344cd0068507bdd8a0192eb7afea1147f2 Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>