Sort output in dump-files

Makes it less frustrating to use.

Test: m dump-files
Change-Id: I84801f37e2e40a37d65d3f9ce7b19a84f3381a53
diff --git a/core/main.mk b/core/main.mk
index 84457e0..eb63336 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1531,7 +1531,7 @@
 .PHONY: dump-files
 dump-files:
 	$(info product_FILES for $(TARGET_DEVICE) ($(INTERNAL_PRODUCT)):)
-	$(foreach p,$(product_FILES),$(info :   $(p)))
+	$(foreach p,$(sort $(product_FILES)),$(info :   $(p)))
 	@echo Successfully dumped product file list
 
 .PHONY: nothing