poplar-kernel: Update kernel to 4.9.172 stable am: f5bc41b27d am: 5fe265529f
am: 0b2e08f661

Change-Id: I2b8f094864f15e31ff0124a3cf37d4bc0c745b38
tree: b517c85230d5aeaebae371a80993334ad8650615
  1. hi3798cv200-poplar.dtb
  2. Image