Ignore OEM Unlocking when wiping PDB during factory reset on V+

On Android V and newer, the PDB will no longer wipe itself on start,
even if OEM Unlocking is enabled, so trusted factory resets must
wipe it.

Bug: 336362291
Flag: EXEMPT bugfix
Test: atest & manual testing
Change-Id: I67cc0fc3e7470c5ddddd03d23942706345361f8f