audio_amplifier: Call calibration after module open

If the audio_amplifier HAL has the amplifier calibration function
defined, call this to allow the HAL calibrate the amplifier right
after opening the module.

Signed-off-by: Luofan Chen <clfbbn@gmail.com>
Depends-On: I9d497fb5d9716bbcbc6ef9035205ee18da994e72
Change-Id: Ie8fbbb855865b41dafb9f289aaed377bdfe9ffe7