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

Change-Id: I5c1becd4226395cdec6d734dd637ac7fa68939d9
tree: a074e1ccb225d8a4cf3338fa6dbd55c8c696e841
  1. 5.4-arm64/
  2. 5.4-x86_64/
  3. scripts/
  4. Android.bp
  5. METADATA
  6. OWNERS
  7. TEST_MAPPING