Make changes guarding the new opt-out scheme overridable

Mark app compat changes guarding the new opt-out rules for D2D transfers
as @Overridable. This allows enabdling / disabling the behaviour without
code changes.

Bug: 186833084
Test: m -j
Change-Id: I97396bd2a27c86ffccffec364cf57d9647bb760d
2 files changed