arm64: dts: rockchip: Drop unneeded model for Radxa CM3i

arm64: dts: rockchip: Drop unneeded model for Radxa CM3i

With module and carrier board topology, carrier board dts will include
module dtsi files for creating complete platform.

The carrier board dts will have final model name and compatible string
so any model name added in module dtsi will eventually replaced.

This happened for any devicetree property if the same property is updated
or added twice.

So, drop this unneeded model name from module dtsi.

Cc: Chukun Pan <amadeus@jmu.edu.cn>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Link: https://lore.kernel.org/r/20230123071654.73139-3-jagan@amarulasolutions.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>