add reboot-to-bootloader and power down options to recovery menu

Useful when debugging or developing for recovery.

Change-Id: Ic3ab42d5e848ad3488f1c575339b55e45c8a024b

default_device.cpp

@@ -29,6 +29,8 @@ static const char* ITEMS[] =  {"reboot system now",
                                "apply update from ADB",
                                "wipe data/factory reset",
                                "wipe cache partition",
+                               "reboot to bootloader",
+                               "power down",
                                NULL };
 
 class DefaultDevice : public Device {
@@ -65,6 +67,8 @@ class DefaultDevice : public Device {
           case 1: return APPLY_ADB_SIDELOAD;
           case 2: return WIPE_DATA;
           case 3: return WIPE_CACHE;
+          case 4: return REBOOT_BOOTLOADER;
+          case 5: return SHUTDOWN;
           default: return NO_ACTION;
         }
     }