recovery: touch UI

[aleasto] make scrolling natural

Change-Id: Ibf64aa70e21d88f9d0b2c60fc1b66a9995837464
diff --git a/recovery_ui/device.cpp b/recovery_ui/device.cpp
index 3d4f594..d205f77 100644
--- a/recovery_ui/device.cpp
+++ b/recovery_ui/device.cpp
@@ -91,6 +91,11 @@
     case KEY_SEARCH:
       return kHighlightUp;
 
+    case KEY_SCROLLUP:
+      return kScrollUp;
+    case KEY_SCROLLDOWN:
+      return kScrollDown;
+
     case KEY_ENTER:
     case KEY_POWER:
     case BTN_MOUSE: