Don't disable dexpreopting implicitly in unbundled builds.

Test: art/test/testrunner/run_build_test_target.py art-linux-bionic-x64
  with TARGET_BUILD_UNBUNDLED enabled in the build scripts
Test: art/test/testrunner/testrunner.py --target --64 --optimizing
  with TARGET_BUILD_UNBUNDLED enabled in chroot on device
Bug: 157549171
Change-Id: I124c341d1801c4afa22f836dd567019de3e9498e

java/dexpreopt_bootjars.go

@@ -179,15 +179,7 @@ func RegisterDexpreoptBootJarsComponents(ctx android.RegistrationContext) {
 }
 
 func skipDexpreoptBootJars(ctx android.PathContext) bool {
-	if dexpreopt.GetGlobalConfig(ctx).DisablePreopt {
-		return true
-	}
-
-	if ctx.Config().UnbundledBuild() {
-		return true
-	}
-
-	return false
+	return dexpreopt.GetGlobalConfig(ctx).DisablePreopt
 }
 
 type dexpreoptBootJars struct {