ipq40xx: add ath10k-calibration-variant in AP120C-AC DTS

Use 'ath10k-calibration-variant' (with the value sent upstream) for the
second (5 GHz) radio in AP120C-AC board DTS. First radio uses the same
BDF as in one of Qualcomm reference designs.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-ap120c-ac.dts

@@ -340,4 +340,5 @@
 
 &wifi1 {
 	status = "okay";
+	qcom,ath10k-calibration-variant = "ALFA-Network-AP120C-AC";
 };

target/linux/ipq40xx/files-4.19/arch/arm/boot/dts/qcom-ipq4018-ap120c-ac.dts

@@ -344,4 +344,5 @@
 
 &wifi1 {
 	status = "okay";
+	qcom,ath10k-calibration-variant = "ALFA-Network-AP120C-AC";
 };