Merge changes from topic "msm8916" into integration

* changes:
  feat(msm8916): allow booting secondary CPU cores
  feat(msm8916): setup hardware for non-secure world
  feat(gic): allow overriding GICD_PIDR2_GICV2 address
  feat(msm8916): initial platform port
  docs(msm8916): new port for Qualcomm Snapdragon 410