dt: bindings: ath10k: add dt entry for XO calibration support

Add dt binding to get xo calibration data support for wifi rf clock.
Signed-off-by: Govind Singh <govinds@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt

@@ -86,7 +86,7 @@ Optional properties:
 	Value type: <empty>
 	Definition: Quirk specifying that the firmware expects the 8bit version
 		    of the host capability QMI request
-
+- qcom,xo-cal-data: xo cal offset to be configured in xo trim register.
 
 Example (to supply PCI based wifi block details):