arm64: dts: qcom: x1e80100-slim7x: Drop incorrect qcom,ath12k-calibration-variant

arm64: dts: qcom: x1e80100-slim7x: Drop incorrect qcom,ath12k-calibration-variant

There is no such property as qcom,ath12k-calibration-variant: neither in
the bindings nor in the driver.  See dtbs_check:

  x1e80100-lenovo-yoga-slim7x.dtb: wifi@0: 'qcom,ath12k-calibration-variant' does not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250225093051.58406-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>