of: make kobject and bin_attribute support configurable

Having device_nodes be kobjects is only needed if sysfs or OF_DYNAMIC is
enabled. Otherwise, having a kobject in struct device_node is
unnecessary bloat in minimal kernel configurations.

Likewise, bin_attribute is only needed in struct property when sysfs is
enabled, so we can make it configurable too.

Change-Id: I0a70d2b4b0d362493987fca2eb91e77ae3171d1e
Tested-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Frank Rowand <frowand.list@gmail.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Rob Herring <robh@kernel.org>
Git-Commit: b56b5528f5b3c3d47e7c0ca67318c45e980d93f0
Git-Repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[pdaly: added NULL check in safe_name()]
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>