poplar-kernel: Update kernel to 4.9.176 and clang
am: cb8b23b46d

Change-Id: I6163cfe07ff8dd109c8eba2c485efbaabc4d3062
tree: 9e2aa9d89740449a9f3ab0aba6c5510fa6de59ce
  1. hi3798cv200-poplar.dtb
  2. Image