fs_mgr_vendor_overlay: Mount vendor overlay with noatime

Change relatime to noatime as our filesystems and partitions are all
read-only, so relatime doesn't really work in the first place.

Test: atest -v fs_mgr_vendor_overlay_test
Test: Presubmit
Change-Id: I869bba24c2d6d8a986bf0eec0f487ba7b935ab4b
diff --git a/fs_mgr/fs_mgr_vendor_overlay.cpp b/fs_mgr/fs_mgr_vendor_overlay.cpp
index 830f0dd..1372511 100644
--- a/fs_mgr/fs_mgr_vendor_overlay.cpp
+++ b/fs_mgr/fs_mgr_vendor_overlay.cpp
@@ -92,7 +92,7 @@
     }
     auto report = "__mount(source=overlay,target="s + vendor_mount_point + ",type=overlay," +
                   options + ")=";
-    auto ret = mount("overlay", vendor_mount_point.c_str(), "overlay", MS_RDONLY | MS_RELATIME,
+    auto ret = mount("overlay", vendor_mount_point.c_str(), "overlay", MS_RDONLY | MS_NOATIME,
                      options.c_str());
     if (ret) {
         PERROR << report << ret;