Remove removed-dex-api generation

Nothing uses these outputs anymore. The compat tools have been
migrated to use a new file in I082d18fc2b8a57ea8c5941d5c955a7970ab9d860.

Bug: 158465496
Test: presubmit
Change-Id: I51a1f3f5e43092f5431358d705379cc33b60b835