ARM: dts: imx6ul: Add DTS for ConnectCore 6UL System-On-Module (SOM)

ARM: dts: imx6ul: Add DTS for ConnectCore 6UL System-On-Module (SOM)

The ConnectCore 6UL System-On-Module has the following hardware
specification:

* Based on a NXP i.MX6UL SoC
* Industrial temperature ranges (-40ºC to +85ºC)
* Up to 1GB DDR3 memory
* Up to 2GB NAND flash
* Dual Ethernet
* On module 802.11 WiFi and Bluetooth 4.2 (QCA6564)
* On module NXP Kinetis KL03
* On module Microchip ATECC508A crypto element

Signed-off-by: Alex Gonzalez <alex.gonzalez@digi.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>