With OF being the only configuration possibility left, depend on it to
simplify some code.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: NSimon Horman <horms+renesas@verge.net.au>
Acked-by: NSteve Twiss <stwiss.opensource@diasemi.com>
Tested-by: NSteve Twiss <stwiss.opensource@diasemi.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NMark Brown <broonie@kernel.org>