hal: Fixes for 8916 features

 * Allow additional offload formats
 * Use correct mixer controls for sample rate and bit width

Change-Id: I7db10c7c90de6736ef5e127808ed7411ad71ff86
hal: Add get_sample_rate for 8960 platforms

Change-Id: I423c502573a0c962a64a51bd80c88c942aa95621