Make libfs_mgr and its dependencies vendor_ramdisk_available.

This is needed to link libfs_mgr with snapuserd.

Bug: 193833730
Test: builds
Change-Id: I5abd706fe134fecebb80ecb790b5be0495e2b925
diff --git a/fs_mgr/Android.bp b/fs_mgr/Android.bp
index abd2483..d4fc2b9 100644
--- a/fs_mgr/Android.bp
+++ b/fs_mgr/Android.bp
@@ -144,6 +144,7 @@
     // It does not have a stable interface.
     name: "libfs_mgr",
     ramdisk_available: true,
+    vendor_ramdisk_available: true,
     recovery_available: true,
     defaults: [
         "libfs_mgr_defaults",
@@ -169,6 +170,7 @@
     name: "libfstab",
     vendor_available: true,
     ramdisk_available: true,
+    vendor_ramdisk_available: true,
     recovery_available: true,
     host_supported: true,
     defaults: ["fs_mgr_defaults"],