vold: write bootloader message directly.

Bug: 27176738
Change-Id: I09bfe777e383325809d7ecc2dcb9129fe234053f
diff --git a/Android.mk b/Android.mk
index 049cd80..fb5e23e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -60,6 +60,7 @@
 	libkeymaster_messages \
 
 common_static_libraries := \
+	libbootloader_message_writer \
 	libfs_mgr \
 	libfec \
 	libfec_rs \