[powerkey] Vibrate when locking device via double powerkey press. Fix…

…es JB#24488

Vibrate powerkey action is available.

Use it when making double press from display on to provide tactile
feedback when device lock is going to get applied in addition to
just turning the display off.

powerkey.h

@@ -117,7 +117,7 @@ typedef enum
 #define DEFAULT_POWERKEY_ACTIONS_SINGLE_ON  "blank,tklock"
 
 /** Default actions for double press while display is on */
-#define DEFAULT_POWERKEY_ACTIONS_DOUBLE_ON  "blank,tklock,devlock"
+#define DEFAULT_POWERKEY_ACTIONS_DOUBLE_ON  "blank,tklock,devlock,vibrate"
 
 /** Default actions for long press while display is on */
 #define DEFAULT_POWERKEY_ACTIONS_LONG_ON    "shutdown"