MIPS: Let __dt_register_buses accept a single bus type

MIPS: Let __dt_register_buses accept a single bus type

Some machines only have one bus type to register (e.g. "simple-bus").

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: f.fainelli@gmail.com
Cc: jaedon.shin@gmail.com
Cc: abrestic@chromium.org
Cc: tglx@linutronix.de
Cc: jason@lakedaemon.net
Cc: jogo@openwrt.org
Cc: arnd@arndb.de
Cc: computersforpeace@gmail.com
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8845/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>