sm8450-common: Enable usage of dex2oat64

Use 64-bit dex2oat for better dexopt time.

Bug: 153380900
Test: boot and install an application
Change-Id: I3e7a6e6e9385ff6564d1a2e6dda004ebb061f095
(cherry picked from commit 126f03be80f57a8a0411842011152d9381589b78)
Merged-In: I3e7a6e6e9385ff6564d1a2e6dda004ebb061f095

properties/vendor.prop

@@ -88,6 +88,9 @@ persist.vendor.vcb.enable=false
 ro.camera.enableCamera1MaxZsl=1
 ro.hardware.camera=xiaomi
 
+# Dex2oat
+dalvik.vm.dex2oat64.enabled=true
+
 # Display
 vendor.display.comp_mask=0
 vendor.display.disable_3d_adaptive_tm=0