Move APFv6 opcode addition APIs to ApfV6Generator

This commit moves all addXXX APIs responsible for adding APFv6 opcodes
from the ApfV4Generator class to ApfV6Generator class.

Bug: 319394073
Test: TH
Change-Id: I3ac423e353a079ad3f9e24369c7bad7be10c214c
3 files changed