dt-bindings: arm: fsl: Add Engicam i.Core MX8M Mini C.TOUCH 2.0

i.Core MX8M Mini is an EDIMM SoM based on NXP i.MX8M Mini from Engicam.

C.TOUCH 2.0 is a general purpose carrier board with capacitive
touch interface support.

i.Core MX8M Mini needs to mount on top of this Carrier board for
creating complete i.Core MX8M Mini C.TOUCH 2.0 board.

Add bindings for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>