Fix newline for dumpconfig

Test: build/make/ci/dump_product_config
Change-Id: Ie4481513b58f589a00b092114135788b1c4c62cd
diff --git a/core/dumpconfig.mk b/core/dumpconfig.mk
index 640fe10..8991d6e 100644
--- a/core/dumpconfig.mk
+++ b/core/dumpconfig.mk
@@ -56,7 +56,7 @@
 
 # Escape quotation marks for CSV, and wraps in quotation marks.
 define escape-for-csv
-"$(subst ","",$1)"
+"$(subst ","",$(subst $(newline), ,$1))"
 endef
 
 # Args: