mark_image_bootable: downgrade warning to info

It's not an error condition, don't raise a warning.

BUG=None
TEST=build_image

Change-Id: I9844e16d7abc2496d2115295119f3646982bd948
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2164209
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Nicolas Norvez <norvez@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/bin/cros_make_image_bootable b/bin/cros_make_image_bootable
index ddb2d06..46a09b2 100755
--- a/bin/cros_make_image_bootable
+++ b/bin/cros_make_image_bootable
@@ -258,7 +258,7 @@
   # TODO(wad) make sure there is parity in the signing scripts.
   if [ ${FLAGS_enable_rootfs_verification} -eq ${FLAGS_TRUE} ]; then
     # TODO(wad) this would be a good place to reset any other ext2 metadata.
-    warn "Disabling r/w mount of the root filesystem"
+    info "Disabling r/w mount of the root filesystem"
     local rootfs_offset="$(partoffset ${image} 3)"
     disable_rw_mount "${image}" "$(( rootfs_offset * 512 ))"
   fi