ARM: dts: Add support for 96Boards Meerkat96 board

Add devicetree support for 96Boards Meerkat96 board from Novtech. This
board is one of the Consumer Edition boards of the 96Boards family based
on i.MX7D SoC. Following are the currently supported features of the
board:

* uSD
* WiFi/BT
* USB

More information about this board can be found in 96Boards product page:
https://www.96boards.org/product/imx7-96/



Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>