pinctrl: zynqmp: Revert "Unify pin naming"

This reverts commit 54784ff2.

This patch changes the pin names from "MIO%d" to "MIO-%d", but all dts
in arch/arm64/boot/dts/xilinx still use the old name. As a result my
ZCU104 has no output on serial terminal and is not reachable over
network.
Signed-off-by: NGerhard Engleder <gerhard@engleder-embedded.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/pinctrl/pinctrl-zynqmp.c

@@ -809,7 +809,6 @@ static int zynqmp_pinctrl_prepare_pin_desc(struct device *dev,
 					   unsigned int *npins)
 {
 	struct pinctrl_pin_desc *pins, *pin;
-	char **pin_names;
 	int ret;
 	int i;
 
@@ -821,14 +820,13 @@ static int zynqmp_pinctrl_prepare_pin_desc(struct device *dev,
 	if (!pins)
 		return -ENOMEM;
 
-	pin_names = devm_kasprintf_strarray(dev, ZYNQMP_PIN_PREFIX, *npins);
-	if (IS_ERR(pin_names))
-		return PTR_ERR(pin_names);
-
 	for (i = 0; i < *npins; i++) {
 		pin = &pins[i];
 		pin->number = i;
-		pin->name = pin_names[i];
+		pin->name = devm_kasprintf(dev, GFP_KERNEL, "%s%d",
+					   ZYNQMP_PIN_PREFIX, i);
+		if (!pin->name)
+			return -ENOMEM;
 	}
 
 	*zynqmp_pins = pins;