poplar-kernel: Update kernel to 4.9.122
am: 221ac36e90

Change-Id: I4f2a5d1c818ec1c64fe8a1a5038e388792f3cb35
tree: bf040ab6be71f8774eb84bb9c039483000e2519f
  1. Image
  2. hi3798cv200-poplar.dtb