This patch takes advantage of driver core which helps to create
and remove sysfs attribute files, so there is no need to register
sysfs entries manually in dfl-afu platform river code.
Signed-off-by: NWu Hao <hao.wu@intel.com>
Acked-by: NMoritz Fischer <mdf@kernel.org>
Signed-off-by: NMoritz Fischer <mdf@kernel.org>