dt-bindings: arm: fsl: imx6dl-colibri: Drop dedicated v1.1 bindings

The dedicated device tree for V1.1 modules has been dropped. Remove
its bindings too.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>