Track own system/{core,extras}

Change-Id: Id8833557d821f914963a073596df049b5d7aa2f8
Track own libcore

Change-Id: I273dd2855f2376f5de4e4a2f2e7335430a7e14db
Track own external/bluetooth/bluedroid, packages/apps/Bluetooth

Change-Id: I253685c732961fcd5b1cec30e438510b7bc24d0d
Track own frameworks/opt/telephony

Change-Id: I05f25369113825ac33aef0b7f5293613993038da
Track own external/icu4c

Change-Id: I4de6aeca659dd2cf0c375b9f718567ab8d67231c