add symbol files to PDK release for debugging

- app_process is not in PDK, and this makes native debugging difficult
  So provide symbol file instead of source

Bug: 6774048

Change-Id: I1a3a86cf64d8f1d22cdb3a22714f508de963099b
diff --git a/core/Makefile b/core/Makefile
index a6974a3..1a36277 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -829,7 +829,8 @@
 	$(hide) rm -f $@
 	$(hide) cd $(dir $@) && zip -qry $(notdir $@) \
 		$(TARGET_COPY_OUT_SYSTEM) \
-		$(patsubst $(PRODUCT_OUT)/%, %, $(TARGET_OUT_NOTICE_FILES))
+		$(patsubst $(PRODUCT_OUT)/%, %, $(TARGET_OUT_NOTICE_FILES)) \
+		$(addprefix symbols/,$(PDK_SYMBOL_FILES_LIST))
 ifeq (true,$(PLATFORM_ZIP_ADD_JAVA))
 	$(hide) cd $(OUT_DIR) && zip -qry $(patsubst $(OUT_DIR)/%,%,$@) $(PDK_PLATFORM_JAVA_ZIP_CONTENTS)
 endif