Remove permission-related app op handling from app op logic.

Permission related app op is now handled in permission
granting/revoking logic, and the previous app op logic was also
error-prone. Since we are only going to use <app-op> element to handle
app ops without associated permissions now, that logic will never be
used and should be removed.

Bug: 110557011
Test: build
Change-Id: Ief9de34826d8294f3273290af69764eb15abc351