dt-bindings: net: Convert Marvell 8897/8997 bindings to DT schema

dt-bindings: net: Convert Marvell 8897/8997 bindings to DT schema

Convert the existing text-based DT bindings for Marvell 8897/8997
(sd8897/sd8997) bluetooth devices controller to a DT schema.

While here, bindings for "usb1286,204e" (USB interface) are dropped from
the DT   schema definition as these are currently documented in file [0].

[0] Documentation/devicetree/bindings/net/btusb.txt

Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@collabora.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>