FROMGIT: of: property: Skip adding device links to suppliers that aren't devices

Some devices need to be initialized really early and can't wait for
driver core or drivers to be functional.  These devices are typically
initialized without creating a struct device for their device nodes.

If a supplier ends up being one of these devices, skip trying to add
device links to them.

Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20191028220027.251605-6-saravanak@google.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry-pick from commit 15956dad5c1016155c82d094f8c1273a30f79c3d
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git driver-core-next)
Bug: 143308885
Change-Id: I0d5a38eec05f5546fe11c23c0d09103ccc35097e