Add BOARD_USES_SYSTEM_OTHER_ODEX := true to mainline

Likely not the final setting we'll settle with for this device,
but brings mainline_system builds closer to the device builds
it's targeting.

Bug: 80410283
Test: build mainline_arm64
Change-Id: Ib672d1a060d0ad6a4e1faa210461bbbbaf6f2bc6
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 7d42fc9..a4b7c26 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -517,6 +517,8 @@
 
 $(call add-clean-step, rm -f $(HOST_OUT)/*ts/host-libprotobuf-java-*.jar)
 
+$(call add-clean-step, find $(OUT_DIR)/target/product/mainline_arm64/system -type f -name "*.*dex" -print0 | xargs -0 rm -f)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************