audio: Update with correct audio format for WMA Pro clips.

-WMA and WMA pro clips differ only based on WMA Version, hence
they have a same mime type.
-To set correct audio format, add an avextension api updateAudioFormat
-This api updates the correct WMA format ( WMA pro or WMA) based on
wma version.

CRs-Fixed: 1028041
Change-Id: I75c7ed56a437c818d7072dbd5092db24bce1baad