Update kernel to builds 6315780 am: 8538c66b28 am: a9f831c6a1

Change-Id: Iad386a62d1c67950203ba7041676757585e0c50c
tree: 24b939eaa82b801901cd52755f9d87f7e80ac405
  1. 5.4-arm64/
  2. 5.4-x86_64/
  3. scripts/
  4. Android.bp
  5. OWNERS
  6. TEST_MAPPING