ARM: dts: add support for Laird WB45N cpu module and DVK

This adds support for Lairds combo CPU module, featuring on board
Atheros wifi, CSR Bluetooth radio and, Atmel CPU.
https://www.lairdtech.com/products/wb45nbt



Signed-off-by: Ben Whitten <ben.whitten@lairdtech.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>