input: snvs_pwrkey: use "wakeup-source" as deivce tree property name

Instead of inventing a new property name, let's use "wakeup-source" to
be consistent with other driver and subsystem bindings.
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/crypto/fsl-sec4.txt

@@ -408,7 +408,7 @@ System ON/OFF key driver
       Value type: <int>
       Definition: Keycode to emit, KEY_POWER by default.
 
-  - wakeup:
+  - wakeup-source:
       Usage: option
       Value type: <boo>
       Definition: Button can wake-up the system.

drivers/input/keyboard/snvs_pwrkey.c

@@ -122,7 +122,7 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
 		dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
 	}
 
-	pdata->wakeup = of_property_read_bool(np, "wakeup");
+	pdata->wakeup = of_property_read_bool(np, "wakeup-source");
 
 	pdata->irq = platform_get_irq(pdev, 0);
 	if (pdata->irq < 0) {