Undo changes to DEFAULT_ACCEPTABLE_BOOT_VERSIONS This partially reverts If1041ca98441889360de3623bfe5024ce4fe5a2f, now that we have JDK11 prebuilts we don't need to bootstrap with JDK9. Bug: 205944740 Test: openjdk build Change-Id: I84c1871e01e1c66bbd4696423072416cfcb69104