Enable secondary dex compilation in the background dexopt job

Test: adb shell cmd package bg-dexopt-job
Bug: 32871170

(cherry picked from commit dc308c1b1d3aa00b8dc7da20f02a4fa21bb94281)

Change-Id: I21664d5e11dada868dab502498b7c5e598852289

Merged-In: I473e291a26335bd766c8845d2ea28c4f1e45db53
diff --git a/target/product/runtime_libart.mk b/target/product/runtime_libart.mk
index 0f42c27..fb52d67 100644
--- a/target/product/runtime_libart.mk
+++ b/target/product/runtime_libart.mk
@@ -80,4 +80,5 @@
     ro.dalvik.vm.native.bridge=0 \
     dalvik.vm.usejit=true \
     dalvik.vm.usejitprofiles=true \
+    dalvik.vm.dexopt.secondary=true \
     dalvik.vm.appimageformat=lz4