msm8974: Initial bringup for L

Change-Id: I94b294558ddcb15df8a900e1af81a090d3fe5dc0
dependencies: remove caf repos

 * they are included by default via manifest now

Change-Id: I0ae605ccd29dff7e3a12025d7ec9eabca7b01d76
msm8974: Add QCOM policy repo

Change-Id: Ic9fce2d728ec97766961cb3fcd9beaf252a2dd90
msm8974: Fix all the things

 * BT, network, sound

Change-Id: I7eaf3f36ef984000e4ea8ae9397cc162b4af1ac3
msm8974: Remove deprecated flags

 * Use Google's new USB audio implementation
 * Remove unnecessary flags

Change-Id: Id2f8dfdecc979b6551625a17732484fb668c8f98