g3: split mixer_paths for bcm/wcnss

Change-Id: Ic29f8420297f55091736d04cb4dece30ac6cbe4c
(cherry picked from commit 205b4c4078bce0402945fb6a81ef58d2892245df)
g3: add d850, d852, and d855 to build barrier

Change-Id: I54fb9212a1c95ff75af39e34a35aa94e3261a419
(cherry picked from commit 363436fbd59e6308ea59766fb1befd272e780208)