Generate retrofit OTA.

Test: m otapackage -j, manual apply on top of P
Bug: 118506262

Change-Id: Iedc389a1058007a604de0482f2348a9ef0d5892a
diff --git a/core/main.mk b/core/main.mk
index 08ab43d..988fbc6 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1391,6 +1391,7 @@
   $(call dist-for-goals, droidcore, \
     $(INTERNAL_UPDATE_PACKAGE_TARGET) \
     $(INTERNAL_OTA_PACKAGE_TARGET) \
+    $(INTERNAL_OTA_RETROFIT_DYNAMIC_PARTITIONS_PACKAGE_TARGET) \
     $(BUILT_OTATOOLS_PACKAGE) \
     $(SYMBOLS_ZIP) \
     $(COVERAGE_ZIP) \