Revert "s/PRODUCT-SERVICES/PRODUCT_SERVICES/g"

This reverts commit 77c778c040bf8717d6c5d4066b533b3d5ece8050.

Reason for revert: git-master break on 4960355

Change-Id: I2fd272c63ef496067f12852bcf98ffc1194c54bf
diff --git a/core/Makefile b/core/Makefile
index ee8303e..52e93b2 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -3214,7 +3214,7 @@
 ifdef BOARD_PRODUCT_SERVICESIMAGE_FILE_SYSTEM_TYPE
 	@# Contents of the product-services image
 	$(hide) $(call package_files-copy-root, \
-		$(TARGET_OUT_PRODUCT_SERVICES),$(zip_root)/PRODUCT_SERVICES)
+		$(TARGET_OUT_PRODUCT_SERVICES),$(zip_root)/PRODUCT-SERVICES)
 endif
 ifdef BOARD_ODMIMAGE_FILE_SYSTEM_TYPE
 	@# Contents of the odm image