Update kernel to builds 6481528 am: 2a48389e2c

Change-Id: Ib67b70bd89c11175d9290bc97dec442fe676022d
tree: 475fac0cee005958da938874e702c6da35aff6d5
  1. 5.4-arm64/
  2. 5.4-x86_64/
  3. scripts/
  4. Android.bp
  5. OWNERS
  6. TEST_MAPPING