audio:sai:mqs: Patch mqs and sai driver to fix audio popping on NALLINO
The i.MX6 ULL has an audio block equipped, that can generate audio via a standard GPIO. Since the MQS (Medium Quality Sound) is a very basic audio interface, it doesn't provide any filtering of unwanted artifacts in the audio stream. This leads to a popping noise when playing audio on the Nallino. The patch changes the SAI to always generate a signal for the MQS and transfers the control of the external amplifier to the MQS driver. This helps in reducing the noticeable interference when playing audio.
Original patch-set by Sam Crossman sam.crossman@seco.com
BCS 746-001388
(cherry picked from commit 0fa8a7d7)