Update kernel to builds 6508538 am: fd08d3aa39 am: 58133a7ecb am: b556d4fb8f

Change-Id: I5edd31c3f860986e0ff646bfd5c3ca5f56fc0924
tree: a074e1ccb225d8a4cf3338fa6dbd55c8c696e841
  1. 5.4-arm64/
  2. 5.4-x86_64/
  3. scripts/
  4. Android.bp
  5. METADATA
  6. OWNERS
  7. TEST_MAPPING