arm64: dts: qcom: sda660-ifc6560: Switch to undeprecated qcom,calibration-variant

arm64: dts: qcom: sda660-ifc6560: Switch to undeprecated qcom,calibration-variant

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>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250225-dts-qcom-wifi-calibration-v1-7-347e9c72dcfc@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>