Merge pi-dev-plus-aosp-without-vendor into stage-aosp-master

Bug: 79597307
Change-Id: I86a5f8b67ed8e54a3a313e7d54b86f1da54c1317
tree: e956bb15597fdabf960c75d1ff27b87f155b4207
  1. BoardConfigCommon.mk
  2. kernel-headers/
  3. msm8x09.mk
  4. original-kernel-headers/