ARM: dts: omap: replace legacy *,wakeup property with wakeup-source

Though the keyboard and other driver will continue to support the legacy
"gpio-key,wakeup", "linux,wakeup" boolean property to enable the wakeup
source, "wakeup-source" is the new standard binding.

This patch replaces all the legacy wakeup properties with the unified
"wakeup-source" property in order to avoid any futher copy-paste
duplication.

Cc: "Benoît Cousson" <bcousson@baylibre.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: linux-omap@vger.kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap3-n900.dts

@@ -67,28 +67,28 @@
 			gpios = <&gpio4 14 GPIO_ACTIVE_LOW>; /* 110 */
 			linux,input-type = <5>; /* EV_SW */
 			linux,code = <0x09>; /* SW_CAMERA_LENS_COVER */
-			gpio-key,wakeup;
+			wakeup-source;
 		};
 
 		camera_focus {
 			label = "Camera Focus";
 			gpios = <&gpio3 4 GPIO_ACTIVE_LOW>; /* 68 */
 			linux,code = <0x210>; /* KEY_CAMERA_FOCUS */
-			gpio-key,wakeup;
+			wakeup-source;
 		};
 
 		camera_capture {
 			label = "Camera Capture";
 			gpios = <&gpio3 5 GPIO_ACTIVE_LOW>; /* 69 */
 			linux,code = <0xd4>; /* KEY_CAMERA */
-			gpio-key,wakeup;
+			wakeup-source;
 		};
 
 		lock_button {
 			label = "Lock Button";
 			gpios = <&gpio4 17 GPIO_ACTIVE_LOW>; /* 113 */
 			linux,code = <0x98>; /* KEY_SCREENLOCK */
-			gpio-key,wakeup;
+			wakeup-source;
 		};
 
 		keypad_slide {
@@ -96,7 +96,7 @@
 			gpios = <&gpio3 7 GPIO_ACTIVE_LOW>; /* 71 */
 			linux,input-type = <5>; /* EV_SW */
 			linux,code = <0x0a>; /* SW_KEYPAD_SLIDE */
-			gpio-key,wakeup;
+			wakeup-source;
 		};
 
 		proximity_sensor {