[1/3] AudioEffects: Add center frequency param to bassboost

Change-Id: Ia47a3f679a82392232b33b72e8dbd3b2545ee109
(cherry picked from commit afe50c398018f3302a54df23579279d8f67d035a)
[2/3] audio_effects: Add a stereo widening effect

Change-Id: I0dd68fef857e8a031f52a63a81c642cb930419c6
(cherry picked from commit 05df050a16637a64927fee8d10074838f8dd3a99)