Drop '#include "ui.h"' from device.h.

We don't need the dependency in the header.

Test: mmma -j bootable/recovery
Change-Id: I03741ae7911a7e8bf1284b2821cf986ca0ab434e
diff --git a/device.h b/device.h
index 74745b3..4ea3159 100644
--- a/device.h
+++ b/device.h
@@ -17,7 +17,8 @@
 #ifndef _RECOVERY_DEVICE_H
 #define _RECOVERY_DEVICE_H
 
-#include "ui.h"
+// Forward declaration to avoid including "ui.h".
+class RecoveryUI;
 
 class Device {
  public: