Instead of "#if defined(CONFIG_OF)" use "IS_ENABLED(CONFIG_OF)" option
for DT code to avoid if-deffery in code.

Also, arranged header files in alphabetically.
Signed-off-by: NManish Badarkhe <badarkhe.manish@gmail.com>
Acked-by: NRhyland Klein <rklein@nvidia.com>
Signed-off-by: NAnton Vorontsov <anton@enomsg.org>