arm64: dts: rockchip: Switch to undeprecated qcom,calibration-variant on RK3399

The property qcom,ath10k-calibration-variant was deprecated in favor of
recently introduced generic qcom,calibration-variant, common to all
Qualcomm Atheros WiFi bindings.

Change will affect out of tree users, like other projects, of this DTS.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250501160208.96451-2-krzysztof.kozlowski@linaro.org


Signed-off-by: Heiko Stuebner <heiko@sntech.de>