Pass /system/etc/updatable-bcp-packages.txt to dex2oat.

Test: aosp_taimen-userdebug boots.
Test: Check logcat for the new argument in the dex2oat
      invocations that happen on first boot.
Bug: 151314205
Change-Id: Id2a14c3810897ead213238b63aee5ff180b56397