ART: Remove LogSeverity NONE

Remove non-standard severity, and instead use a new enum to
configure verifier logging.

Partially reverts commit 7fe30233d32a872f5349e921dba65bd767ad994b.

Bug: 31338270
Test: m test-art-host
Change-Id: If52ee23c4902fbf2dabe7b232f6742448764ff8c
9 files changed