Add ramdisk_available to init_first_stage's deps

Bug: 187196593
Test: boot
Change-Id: I0a9ba90f0ae6f0b551e73d0a4361b8cf5d2c1e85
diff --git a/Android.bp b/Android.bp
index a37a34f..e07681b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -147,6 +147,7 @@
 cc_library_static {
     name: "update_metadata-protos",
     host_supported: true,
+    ramdisk_available: true,
     recovery_available: true,
 
     srcs: ["update_engine/update_metadata.proto"],