dt-bindings: arm: fsl: Decrease the line length

Decrease the line length of the toradex colibri boards to fix the
following build warning:

./Documentation/devicetree/bindings/arm/fsl.yaml:684:111: [warning]
line too long (111 > 110 characters) (line-length)

The description already contains the SoM name, do not repeat it
in every single line.

Reported-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>