update_engine: Use scaled slotting

Start using scaled DLC uploaded/ingested during CrOS release builds.

BUG=b:236008158
TEST=unittest + deploy

Change-Id: Iffdb359eccc19e8f7a013e98a302f18b57d96506
Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/system/update_engine/+/4000551
Auto-Submit: Jae Hoon Kim <[email protected]>
Reviewed-by: Yuanpeng Ni‎ <[email protected]>
Tested-by: Jae Hoon Kim <[email protected]>
Commit-Queue: Jae Hoon Kim <[email protected]>
diff --git a/cros/install_action.cc b/cros/install_action.cc
index 74e6c92..3f62cdc 100644
--- a/cros/install_action.cc
+++ b/cros/install_action.cc
@@ -42,7 +42,7 @@
 
 constexpr char kDefaultArtifact[] = "dlc.img";
 constexpr char kDefaultPackage[] = "package";
-constexpr char kDefaultSlotting[] = "dlc";
+constexpr char kDefaultSlotting[] = "dlc-scaled";
 
 constexpr char kManifestFile[] = "imageloader.json";