finalize_branch_for_release: Don't build droidcore

'm droidcore' doesn't reproduce the same issues as `m`

Test: ./finalize_branch_for_release.sh
Bug: 258050166
Change-Id: I19efb49e6ece3f73010f757ebed0f0503698daed
diff --git a/finalize_branch_for_release.sh b/finalize_branch_for_release.sh
index b46390d..9e9d6a1 100755
--- a/finalize_branch_for_release.sh
+++ b/finalize_branch_for_release.sh
@@ -17,7 +17,7 @@
     #   Resource/SDK finalization.
     # In the future, we would want to actually turn the branch into the REL
     # state and test with that.
-    AIDL_FROZEN_REL=true $m droidcore
+    AIDL_FROZEN_REL=true $m
 
     # Build SDK (TODO)
     # lunch sdk...