arm64: dts: imx8mn-rve-gateway: remove redundant company name

Company name in compatible description appears twice, which is not really
helpful, so remove it from product name.

The board is a prototype developed by my company and we are still at the
prototype stage, so there is zero ABI impact.

Fixes: 67275c2f ("arm64: dts: freescale: introduce rve-gateway board")
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>