staging: clocking-wizard: Rename speed-grade to xlnx,speed-grade

Rename speed-grade to xlnx,speed-grade
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Link: https://lore.kernel.org/r/1614172241-17326-3-git-send-email-shubhrajyoti.datta@xilinx.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c

@@ -147,7 +147,7 @@ static int clk_wzrd_probe(struct platform_device *pdev)
 	if (IS_ERR(clk_wzrd->base))
 		return PTR_ERR(clk_wzrd->base);
 
-	ret = of_property_read_u32(np, "speed-grade", &clk_wzrd->speed_grade);
+	ret = of_property_read_u32(np, "xlnx,speed-grade", &clk_wzrd->speed_grade);
 	if (!ret) {
 		if (clk_wzrd->speed_grade < 1 || clk_wzrd->speed_grade > 3) {
 			dev_warn(&pdev->dev, "invalid speed grade '%d'\n",