[automerger skipped] Update kernel to builds 6481528 am: 2a48389e2c -s ours am: cbe6b0d905 -s ours

am skip reason: Change-Id I1c4774be490469495f4ce0876cd13364f5045a68 with SHA-1 d81e1d9139 is in history

Change-Id: I437237cc43965354269d39af219260f5c8d5e0d2