arm64: dts: qcom: sdm845-mtp: specify wifi variant

Specify the variant for the WiFi BDF file, "Qualcomm_sdm845mtp" to ease
distinguishing from other (possible) devices using the same board id.

For the reference:

ath10k_snoc 18800000.wifi: qmi chip_id 0x30214 chip_family 0x4001 board_id 0x3f soc_id 0x40030001
ath10k_snoc 18800000.wifi: qmi fw_version 0x2009856b fw_build_timestamp 2018-07-19 12:28 fw_build_id QC_IMAGE_VERSION_STRING=WLAN.HL.2.0-01387-QCAHLSWMTPLZ-1
ath10k_snoc 18800000.wifi: failed to fetch board data for bus=snoc,qmi-board-id=3f,qmi-chip-id=30214,variant=Qualcomm_sdm845mtp from ath10k/WCN3990/hw1.0/board-2.bin
ath10k_snoc 18800000.wifi: wcn3990 hw1.0 target 0x00000008 chip_id 0x00000000 sub 0000:0000
ath10k_snoc 18800000.wifi: kconfig debug 1 debugfs 0 tracing 0 dfs 0 testmode 0
ath10k_snoc 18800000.wifi: firmware ver  api 5 features wowlan,mgmt-tx-by-reference,non-bmi crc32 b3d4b790
ath10k_snoc 18800000.wifi: htt-ver 3.53 wmi-op 4 htt-op 3 cal file max-sta 32 raw 0 hwcrypto 1
ath10k_snoc 18800000.wifi: invalid MAC address; choosing random

Cc: Kalle Valo <kvalo@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20230826221915.846937-3-dmitry.baryshkov@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sdm845-mtp.dts

@@ -718,6 +718,7 @@ &wifi {
 	vdd-3.3-ch0-supply = <&vreg_l25a_3p3>;
 
 	qcom,snoc-host-cap-8bit-quirk;
+	qcom,ath10k-calibration-variant = "Qualcomm_sdm845mtp";
 };
 
 /* PINCTRL - additions to nodes defined in sdm845.dtsi */