am 557fa1ba: (-s ours) am 14700691: (-s ours) am 2fa40ea0: (-s ours) Updating SDK prebuilts to LKY63. DO NOT MERGE ANYWHERE

* commit '557fa1ba0009c52290aed18b07e95130dbb7ef73':
  Updating SDK prebuilts to LKY63. DO NOT MERGE ANYWHERE