dt-bindings: arm: rockchip: Correct the descriptions for Radxa boards

dt-bindings: arm: rockchip: Correct the descriptions for Radxa boards

Correct the descriptions of a few Radxa boards, according to the up-to-date
documentation from Radxa and the detailed explanation from Naoki. [1]  To sum
it up, the short naming, as specified by Radxa, is preferred.

[1] https://lore.kernel.org/linux-rockchip/B26C732A4DCEA9B3+282b8775-601b-4d4a-a513-4924b7940076@radxa.com/

Suggested-by: FUKAUMI Naoki <naoki@radxa.com>
Signed-off-by: Dragan Simic <dsimic@manjaro.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/1e148d6cd4486b31b5e7f3824cf6bccf536b74c0.1713457260.git.dsimic@manjaro.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>