init: only mlock() system pages when performing snapuserd transitions.

Bug: 181032115
Test: manual test w/ VABC OTA
Change-Id: Ib4d2856b9b5eaf8688534f9d84edeb64d4b3244d
diff --git a/init/Android.mk b/init/Android.mk
index 65ee385..3c7d95a 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -130,6 +130,7 @@
     libsnapshot_cow \
     libsnapshot_init \
     update_metadata-protos \
+    libprocinfo \
 
 LOCAL_SANITIZE := signed-integer-overflow
 # First stage init is weird: it may start without stdout/stderr, and no /proc.