Return NULL for unsupported board.
Signed-off-by: NAaro Koskinen <aaro.koskinen@iki.fi>
Cc: David Daney <ddaney.cavm@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12581/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>