Installd: Add a swap override flag

Add dalvik.vm.dex2oat-swap system property to override a default
decision.

Bug: 20658562

(cherry picked from commit c968c0175e967e39e72f557b5e014b9575ba4727)

Change-Id: I34368c6e435d1a9ceec20a0bf1c8c6213e527f5e
1 file changed