Switch system/core to aosp source

Change-Id: I8ae7e4d170d3fb7fef412dabccae35c314caaadb
Switch libhardware and libhardware legacy to aosp source

Change-Id: I078aa202602bd31b1580fedecc6f42205a71fea0
Revert libhardware, libhardware legacy, nci and nxp swaps

Change-Id: If7bde9b98a1d33a90c5ed415eafd9b7a97c76fa4
Revert clang back

Change-Id: I472cd28ec23b456a115d74907eaebc8a1cfc1e63