dt-bindings: mips: Add bindings for Microsemi SoCs

Add bindings for Microsemi SoCs. Currently only Ocelot is supported.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Rob Herring <robh+dt@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Allan Nielsen <Allan.Nielsen@microsemi.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18854/


Signed-off-by: James Hogan <jhogan@kernel.org>